Tektronix Camcorder 1780 R User Manual

Operator’s Manual

1780R-Series

Video Measurement Set

070-6890-08

This document supports firmware version 1.10 to

1.16.

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WARRANTY

Tektronix warrants that the products that it manufactures and sells will be free from defects

in materials and workmanship for a period of three (3) years from the date of shipment. If a

product proves defective during this warranty period, Tektronix, at its option, either will

repair the defective product without charge for parts and labor, or will provide a

replacement in exchange for the defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of the

defect before the expiration of the warranty period and make suitable arrangements for the

performance of service. Customer shall be responsible for packaging and shipping the

defective product to the service center designated by Tektronix, with shipping charges

prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to

a location within the country in which the Tektronix service center is located. Customer

shall be responsible for paying all shipping charges, duties, taxes, and any other charges for

products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or

improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish

service under this warranty a) to repair damage resulting from attempts by personnel other

than Tektronix representatives to install, repair or service the product; b) to repair damage

resulting from improper use or connection to incompatible equipment; c) to repair any

damage or malfunction caused by the use of non-Tektronix supplies; or d) to service a

product that has been modified or integrated with other products when the effect of such

modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX IN LIEU OF ANY OTHER

WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS

DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR

FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY

TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND

EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF

THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE

FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL

DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR

HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

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Contacting Tektronix

Product

Support

For questions about using Tektronix measurement

products, call toll free in North America:

1-800-TEK-WIDE (1-800-835-9433 ext. 2400)

6:00 a.m. – 5:00 p.m. Pacific time

Or contact us by e-mail:

[email protected]

For product support outside of North America,

contact your local Tektronix distributor or sales

office.

Service

Support

Tektronix offers extended warranty and calibration

programs as options on many products. Contact

your local Tektronix distributor or sales office.

For a listing of worldwide service centers, visit our

web site.

For other

In North America:

information 1-800-TEK-WIDE (1-800-835-9433)

An operator will direct your call.

To write us Tektronix, Inc.

P.O. Box 1000

Wilsonville, OR 97070-1000

USA

Website

Tektronix.com

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Table of Contents

General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Getting Started

Documentation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–1

1–2

1–3

1–4

1–9

Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . .

Who Should Use This Operator’s Manual . . . . . . . . . . . . . . . . .

1780R-Series Product Overview . . . . . . . . . . . . . . . . . . . . . . . .

New Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Touch Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1780R-Series Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mechanical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Rack-Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–10

Connectors, Controls, Indicators

Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Companion Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audio Feedback (Beep) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A Beep Sounds When: . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Disable the Beep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A “Click” Occurs When: . . . . . . . . . . . . . . . . . . . . . . . . . . .

Touch Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Front-Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1

2–2

2–3

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Table of Contents

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3

2–5

2–7

2–8

2–9

CRT Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Precision Measurement (Large Knob) . . . . . . . . . . . . . . . . .

Menu Access Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ref . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12

Wfm Horizontal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12

Magnifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–12

Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–13

Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–14

Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–15

Rear Panel Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–16

Operating Instructions

Large Knob And Associated Switches . . . . . . . . . . . . . . . . . . .

3–1

3–2

3–3

3–5

3–6

Timing Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage Cursors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Line Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Phase Shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reference Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

< > Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Graticules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Scale Illumination for Vector and Waveform Graticules . . .

Using The Vector Graticule . . . . . . . . . . . . . . . . . . . . . . . . .

Using The Waveform Graticule . . . . . . . . . . . . . . . . . . . . . . 3–12

Remote Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–15

REMOTE Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–15

Remote Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–15

Serial Communications Interface . . . . . . . . . . . . . . . . . . . . . . . 3–18

Serial Interface Connector . . . . . . . . . . . . . . . . . . . . . . . . . . 3–18

Building a Wiring Converter . . . . . . . . . . . . . . . . . . . . . . . . 3–18

Serial Remote Information . . . . . . . . . . . . . . . . . . . . . . . . . . 3–19

SCH Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–21

SCH Phase Measurement Procedure . . . . . . . . . . . . . . . . . . 3–22

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Table of Contents

Parade Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–23

Two Line or Field Parade . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–23

Three Line Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–23

Offset Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–23

DC Level Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–24

DC Level Measurement Procedure . . . . . . . . . . . . . . . . . . . 3–25

Overlay Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–26

Overlaid Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–26

Offset Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–26

WFM + CAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–27

Enter WFM+CAL Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–27

General WFM+CAL Information . . . . . . . . . . . . . . . . . . . . 3–27

Menu Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–31

Menu Documentation Overview . . . . . . . . . . . . . . . . . . . . . 3–31

Menu Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–32

Touch Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–32

Password Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–34

Enable / Disable the Password . . . . . . . . . . . . . . . . . . . . . . . 3–34

Define the Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–34

Change the Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–35

Use the Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–35

Incorrect Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–35

Preset Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–36

Recall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–36

Recover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–38

Store . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–39

Name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–40

Calibrate Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–42

General Calibration Menu Information . . . . . . . . . . . . . . . . 3–42

Waveform Calibration Information . . . . . . . . . . . . . . . . . . . 3–42

Waveform Calibration Procedure . . . . . . . . . . . . . . . . . . . . . 3–43

Vectorscope Calibration Information . . . . . . . . . . . . . . . . . . 3–46

Vectorscope Calibration Procedure . . . . . . . . . . . . . . . . . . . 3–46

Vectorscope Calibration Procedure . . . . . . . . . . . . . . . . . . . 3–49

Configure Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–52

Changing Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–52

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iii

Table of Contents

Measure Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–56

Using the Measure Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–56

Beep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–57

Store and Recall Modified Setups . . . . . . . . . . . . . . . . . . . . 3–57

Making Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–58

Measurements

Measurement Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1

4–2

4–5

4–6

4–7

Differential Phase Measurement . . . . . . . . . . . . . . . . . . . . . . . .

Enter DIFF PHASE Mode . . . . . . . . . . . . . . . . . . . . . . . . . .

Exit DIFF PHASE Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .

DIFF PHASE Menu Selections . . . . . . . . . . . . . . . . . . . . . .

DIFF PHASE Measurement Information . . . . . . . . . . . . . .

Single-Trace DIFF PHASE Measurement Procedure . . . . .

Double-Trace DIFF PHASE Measurement Procedure . . . .

Using Line Select in DIFF PHASE . . . . . . . . . . . . . . . . . . .

Differential Gain Measurement . . . . . . . . . . . . . . . . . . . . . . . . .

Enter DIFF GAIN Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exit DIFF GAIN Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DIFF GAIN Menu Selections . . . . . . . . . . . . . . . . . . . . . . .

DIFF GAIN Measurement Information . . . . . . . . . . . . . . . . 4–10

Single-Trace DIFF GAIN Measurement Procedure . . . . . . 4–10

Double-Trace DIFF GAIN Measurement Procedure . . . . . . 4–11

Using Line Select in DIFF GAIN . . . . . . . . . . . . . . . . . . . . 4–11

Simultaneous Diff Phase & Diff Gain Measurements . . . . . . . . 4–12

Enter DP & DG Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–12

Exit DP & DG Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–12

DP & DG Menu Selections . . . . . . . . . . . . . . . . . . . . . . . . . 4–12

DP & DG Measurement Information . . . . . . . . . . . . . . . . . . 4–14

DIFF PHASE & DIFF GAIN Measurement Procedure . . . 4–15

Noise Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–16

Enter Noise Measurement Mode . . . . . . . . . . . . . . . . . . . . . 4–16

Exit Noise Measurement Mode . . . . . . . . . . . . . . . . . . . . . . 4–16

Noise Measurement Procedure . . . . . . . . . . . . . . . . . . . . . . 4–16

ICPM Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–17

Enter ICPM Measurement Mode . . . . . . . . . . . . . . . . . . . . . 4–17

Exit ICPM Measurement Mode . . . . . . . . . . . . . . . . . . . . . . 4–17

ICPM Measurement Information . . . . . . . . . . . . . . . . . . . . . 4–17

ICPM Measurement Procedure . . . . . . . . . . . . . . . . . . . . . . 4–18

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K Factor Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–20

Enter K Factor Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–20

Making K Factor Measurements . . . . . . . . . . . . . . . . . . . . . 4–20

Chroma / Luma Inequalities Measurement . . . . . . . . . . . . . . . . 4–23

Enter Chroma / Luma Mode . . . . . . . . . . . . . . . . . . . . . . . . 4–23

Exit Chroma / Luma Mode . . . . . . . . . . . . . . . . . . . . . . . . . 4–23

Cursors in Chroma / Luma . . . . . . . . . . . . . . . . . . . . . . . . . . 4–23

Making Chroma / Luma Measurements (Using Cursors) . . 4–23

Chroma / Luma Measurements with Lissajous Display . . . 4–27

Short-Time Distortion Measurement . . . . . . . . . . . . . . . . . . . . . 4–28

Enter Short-Time Distortion Mode . . . . . . . . . . . . . . . . . . . 4–28

Exit Short-Time Distortion Measurement Mode . . . . . . . . . 4–28

Short-Time Distortion Measurement Procedure . . . . . . . . . 4–28

R–Y Sweep Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–31

Enter R–Y Sweep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–31

Exit R–Y Sweep Measurement Mode . . . . . . . . . . . . . . . . . 4–31

R–Y Sweep Mode Information . . . . . . . . . . . . . . . . . . . . . . 4–32

Using R–Y Sweep Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–32

Bowtie Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–33

Enter Bowtie Measurement Mode . . . . . . . . . . . . . . . . . . . . 4–33

Bowtie Measurement Procedure . . . . . . . . . . . . . . . . . . . . . 4–33

Time Marks Measurement . . . . . . . . . . . . . . . . . . . . . . . . . 4–36

Enter F Time Marks Measurement Mode . . . . . . . . . . . . 4–36

Exit F Time Marks Measurement Mode . . . . . . . . . . . . . 4–36

Making SCH Phase Measurements . . . . . . . . . . . . . . . . . . . 4–37

Voltage Cursors in F Time Marks Mode . . . . . . . . . . . . . 4–37

Verifying Burst Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–37

Other Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–38

Specifications

Options and Accessories

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6–1

6–2

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Index

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Table of Contents

List of Figures

Figure 1–1: Location of the four screws that secure the

instrument to rack-mounting cabinet or portable case .

1–5

1–6

1–7

1–8

2–4

Figure 1–2: Dimensions used for rack-mounting the

1780R-Series Video Measurement Set . . . . . . . . . . . . . . .

Figure 1–3: Dimensions of the adjustable rear

rack-mounting bracket . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1–4: Installing rear rack-mounting brackets for rack

applications of depths from 18 to 24 inches . . . . . . . . . . .

Figure 2–1: Left side of front panel . . . . . . . . . . . . . . . . . . . .

Figure 2–2: Right side of front panel . . . . . . . . . . . . . . . . . . . 2–10

Figure 2–3: Rear-Panel Connectors . . . . . . . . . . . . . . . . . . . . 2–17

Figure 3–1: Line Select Menu Screen with <2 OF 4> Fields

selected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–4

Figure 3–2: Line Select Menu Screen with <1 OF 8> Fields

selected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3–5

3–7

3–8

Figure 3–3: 1780R Vector Graticule . . . . . . . . . . . . . . . . . . .

Figure 3–4: 1781R Vector Graticule . . . . . . . . . . . . . . . . . . .

Figure 3–5: Rear-panel X–Y Connector Pin Assignments . . 3–11

Figure 3–6: 1780R Waveform Graticule . . . . . . . . . . . . . . . . 3–12

Figure 3–7: 1781R Waveform Graticule . . . . . . . . . . . . . . . . 3–13

Figure 3–8: REMOTE Connector Pin Assignments . . . . . . . 3–15

Figure 3–9: Serial Interface Connector Pin Assignments . . 3–18

Figure 3–10: Serial Interface Connector Wiring Converter 3–19

Figure 3–11: Portion of the 1780R-Series Front Panel . . . . . 3–21

Figure 3–12: Offsets Menu Screen . . . . . . . . . . . . . . . . . . . . . 3–24

Figure 3–13: WFM + CAL Readout with ABS selected . . . . 3–28

Figure 3–14: WFM + CAL Readout with REL selected . . . 3–28

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Table of Contents

Figure 3–15: Left Side of Front Panel, showing Menu Buttons

and Touch Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–31

Figure 3–16: Touch Screen 4 X 4 Matrix . . . . . . . . . . . . . . . . 3–33

Figure 3–17: Password Menu Screen . . . . . . . . . . . . . . . . . . . 3–34

Figure 3–18: Preset Menu Screen . . . . . . . . . . . . . . . . . . . . . . 3–36

Figure 3–19: Name Menu Screen . . . . . . . . . . . . . . . . . . . . . . 3–41

Figure 3–20: Waveform Calibration Menu Display . . . . . . . 3–44

Figure 3–21: Vectorscope Calibration Menu Display for

1780R (NTSC), software versions 1.11 & Up, with

CAL OSC Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–47

Figure 3–22: Vectorscope Calibration Menu Display for

1780R (NTSC), software versions 1.11 & Up, with

CAL OSC On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–48

Figure 3–23: Vectorscope Calibration Menu Display for

1781R (PAL) all software versions, and for 1780R (NTSC)

software versions 1.10 & Below . . . . . . . . . . . . . . . . . . . . 3–50

Figure 3–24: Configure Menu Screen, page 1 . . . . . . . . . . . . 3–53

Figure 3–25: Configure Menu Screen, page 2 . . . . . . . . . . . . 3–54

Figure 3–26: Configure Menu Screen, page 3 . . . . . . . . . . . . 3–55

Figure 3–27: Measure Menu Screen . . . . . . . . . . . . . . . . . . . 3–56

Figure 4–1: Measure Menu Access . . . . . . . . . . . . . . . . . . . . .

Figure 4–2: Differential Phase Measurement . . . . . . . . . . . .

Figure 4–3: Differential Gain Measurement . . . . . . . . . . . . .

4–1

4–3

4–8

Figure 4–4: DP & DG Measurement . . . . . . . . . . . . . . . . . . . 4–13

Figure 4–5: Making ICPM Measurements . . . . . . . . . . . . . . 4–19

Figure 4–6: K Factor Electronic Graticule . . . . . . . . . . . . . . 4–21

Figure 4–7: Initial Chroma / Luma Inequalities

Measurement Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–24

Figure 4–8: Setting Timing Cursors to Pulse Width . . . . . . 4–26

Figure 4–9: Short-Time Distortion Electronic Graticule . . . 4–29

Figure 4–10: Bowtie Measurement Screen . . . . . . . . . . . . . . 4–34

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vii

Table of Contents

List of Tables

Table 2–1: Possible Parade and Overlay Configurations . . 2–11

Table 2–2: Waveform Magnification . . . . . . . . . . . . . . . . . . . 2–13

Table 2–3: Multiple Filter Displays . . . . . . . . . . . . . . . . . . . . 2–14

Table 2–4: Possible CH B1, CH B2, CH B3 Switch Settings

2–15

Table 3–1: Plug Jumpers for Vectorscope Board . . . . . . . . . 3–10

Table 3–2: Remote Pin Functions . . . . . . . . . . . . . . . . . . . . . 3–16

Table 3–3: Serial Remote Commands to the 1780R-Series . 3–20

Table 3–4: 1780R-Series Responses . . . . . . . . . . . . . . . . . . . . 3–20

Table 3–5: Initial Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–37

Table 3–6: Configure Menu Selections, page 1 . . . . . . . . . . 3–53

Table 3–7: Configure Menu Selections, page 2 . . . . . . . . . . 3–54

Table 3–8: Configure Menu Selections, page 3 . . . . . . . . . . 3–55

Table 3–9: Measure Menu Description . . . . . . . . . . . . . . . . . 3–57

Table 4–1: DIFF PHASE Front-Panel Configuration . . . . .

Table 4–2: DIFF GAIN Front-Panel Configuration . . . . . .

4–4

4–9

Table 4–3: DP & DG Front-Panel Configuration . . . . . . . . 4–14

Table 4–4: ICPM Front-Panel Configuration . . . . . . . . . . . 4–17

Table 4–5: K Factor Front-Panel Configuration . . . . . . . . . 4–22

Table 4–6: Chroma / Luma Front-Panel Configuration . . . 4–25

Table 4–7: Short-Time Distortion Mode Front-Panel

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–30

Table 4–8: R–Y Sweep Mode Front-Panel Configuration

Table 4–9: Bowtie Mode Front-Panel Configuration . . . . . 4–35

Table 4–10: F Time Marks Front-Panel Configuration . 4–36

4–31

Table 5–1: Input/Output . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–1

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Table of Contents

Table 5–2: Waveform Monitor Vertical System . . . . . . . . . .

5–2

5–7

Table 5–3: Waveform Monitor Probe Input . . . . . . . . . . . . .

Table 5–4: Waveform Monitor Horizontal Deflection

System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5–7

Table 5–5: Waveform Monitor DG and DP Display . . . . . . 5–11

Table 5–6: Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . 5–13

Table 5–7: Vectorscope Vector Display . . . . . . . . . . . . . . . . . 5–15

Table 5–8: Vectorscope XY Display . . . . . . . . . . . . . . . . . . . 5–18

Table 5–9: Vectorscope SCH Phase Display . . . . . . . . . . . . . 5–18

Table 5–10: CRTs and High Voltage Supplies . . . . . . . . . . . 5–19

Table 5–11: Power Requirements . . . . . . . . . . . . . . . . . . . . . 5–20

Table 5–12: Physical Characteristics . . . . . . . . . . . . . . . . . . 5–20

Table 5–13: Certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–21

Table 5–14: Environmental Summary . . . . . . . . . . . . . . . . . 5–21

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Table of Contents

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General Safety Summary

Review the following safety precautions to avoid injury and prevent

damage to this product or any products connected to it. To avoid

potential hazards, use this product only as specified.

Only qualified personnel should perform service procedures.

To Avoid Fire or Personal Injury

Use Proper Power Cord. Use only the power cord specified for this

product and certified for the country of use.

Use Proper Voltage Setting. Before applying power, ensure that the line

selector is in the proper position for the power source being used.

Connect and Disconnect Properly. Do not connect or disconnect probes

or test leads while they are connected to a voltage source.

Ground the Product. This product is grounded through the grounding

conductor of the power cord. To avoid electric shock, the grounding

conductor must be connected to earth ground. Before making

connections to the input or output terminals of the product, ensure

that the product is properly grounded.

Observe All Terminal Ratings. To avoid fire or shock hazard, observe all

ratings and markings on the product. Consult the product manual for

further ratings information before making connections to the product.

Do not apply a potential to any terminal, including the common

terminal, that exceeds the maximum rating of that terminal.

Do Not Operate Without Covers. Do not operate this product with

covers or panels removed.

Use Proper Fuse. Use only the fuse type and rating specified for this

product.

Avoid Exposed Circuitry. Do not touch exposed connections and

components when power is present.

Wear Eye Protection. Wear eye protection if exposure to high-intensity

rays or laser radiation exists.

Do Not Operate With Suspected Failures. If you suspect there is damage

to this product, have it inspected by qualified service personnel.

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General Safety Summary

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

Provide Proper Ventilation. Refer to the manual’s installation

instructions for details on installing the product so it has proper

ventilation.

Safety Terms and Symbols

Terms in This Manual. These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that

could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that

could result in damage to this product or other property.

Terms on the Product. These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you

read the marking.

WARNING indicates an injury hazard not immediately accessible as

you read the marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product. These symbols may appear on the product:

Double

Insulated

Protective Ground

(Earth) Terminal

CAUTION

Refer to Manual

WARNING

High Voltage

Not suitable for

connection to

the public telecom-

munications network

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Getting Started

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Getting Started

Documentation Overview

This operator’s manual is one of a set of two manuals that document

the Tektronix 1780R-Series Video Measurement Set. To purchase a

service manual, please refer to the “Contacting Tektronix” page

located near the front of this manual for address and phone number

information.

The topics covered in the two manuals are as follows:

Operator’s Manual

Section 1

Document Overview

Product Overview

Installation

Section 2

Connectors, Controls, Indicators

(including front- and rear-panel illustrations)

Section 3

Section 4

Section 5

Section 6

Operating Instructions (including menus)

Measurements

Specifications

Options and Accessories

Service Manual

Installation

Theory of Operation

Performance Check and Adjustment Procedure

Maintenance

Options

Replaceable Electrical and Mechanical Parts Lists

(with accessory part numbers)

Schematic Diagrams and Circuit Board Illustrations

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Getting Started

Documentation Conventions

Within this manual, front-panel push-button names are shown all in

capitals, such as the PRESET menu button. Touch screen words are

represented in brackets, such as <DEFAULT>. CRT instructional

labels, such as SELECT MEASUREMENT, are represented in italics

in the manual and on the instrument CRT.

In menu operation, most selections are made by actually touching

the desired area on the CRT screen. This is indicated in the manual

instructions by the use of the word ‘touch’ (as opposed to ‘push’ for

front-panel push buttons).

Who Should Use This Operator’s Manual:

This operator’s manual contains information necessary for daily use,

and is appropriate for use by anyone who operates the 1780R-Series

Video Measurement Set. (The service manual is intended for use by

qualified service personnel only.)

1780R-Series Product Overview

The 1780R-Series Video Measurement Set is a wide bandwidth,

multi-input, waveform/vector/SCH measurement package.

The advantages of separate waveform and vector instruments are

provided in a single package. Specific measurements take advantage

of the 1780R-Series’ shared waveform monitor and vectorscope

internal processing.

Separate waveform and vectorscope CRTs allow simultaneous

monitoring of several video parameters.

Four video inputs may be individually displayed or selected in

various combinations on the waveform monitor. Vector presentations

may be individually displayed, overlaid for comparison, or compared

to an external reference. A fifth video signal may be selected for

individual display via the high-impedance front-panel probe input.

Internal video filters provide specialized measurements, with dual or

triple filter modes available for simultaneous display.

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Getting Started

A selection of internal and external graticules and electronic cursors

permit measurements specific to many studio and transmission

system applications. An external horizontal input facilitates ICPM

measurements.

External staircase from a camera control unit may be selected

remotely.

Slow sweep is standard on the 1780R-Series.

New Capabilities

A precision phase control, with on-screen digital phase readout,

allows precision phase angle measurements. Differential display

resolution is within .05_, with an absolute accuracy of 0.1_ around

the full 360_ vector range.

The Tektronix double-trace differential phase measurement

technique has been enhanced with a digital recursive vertical filter to

permit accurate on-screen readouts in the presence of noise.

The F Time Marks feature (NTSC ONLY) allows the operator to

verify the accuracy of SCH Phase measurements.

Voltage cursors or Timing cursors can be set to any point, providing

accurate on-screen measurement readouts, and are fully operational

and accurate at all Gain and Magnifier settings.

In addition to the standard remote interface provided on 1700 Series

products, the 1780R-Series provides a serial remote interface,

compatible with RS232 and RS422 standards.

Touch Screen

The 1780R-Series has four main menu modes that provide on-screen

measurement and calibration selections. Through the Preset menu,

the operator can define, name, save, and recall up to 12 front-panel

setups.

Many instrument settings can be easily changed through the

1780R-Series touch screen menus. For example, the Configure menu

allows the choice of internal or external graticule illumination, and

the Calibrate menu allows trace rotation and readout intensity

adjustments. The Measurement menu provides entry into specific

measurement modes.

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Getting Started

1780R-Series Package

The 1780R-Series is supplied as a single 5 1/4-inch high package,

ready for rack-mounting. A portable cabinet is available, providing

handle, feet, and front and rear covers. The instrument is equipped

with a high reliability cooling fan so that no clearance is required

above or below the 1780R-Series.

Mechanical Installation

All qualification testing for the 1780R-Series was performed with

the rack-mount cabinet installed. To guarantee compliance with

specifications, the instrument should be operated in a cabinet, either

the rack-mount cabinet or the portable case (1780F02). The 1780F02

case has a handle and front and back covers. The front and back

covers provide protection for the instrument during transportation

and storage.

NOTE. Cabinet drawings are provided for installation information

only, and are not to scale. All dimensions are in inches.

The rack-mounting cabinet is a standard accessory; all instruments

are factory shipped in this cabinet. Rack-mounting hardware is

included and listed in Table 1–1. The portable case (1780F02) is

available from Tektronix as an Optional Accessory. It, as does the

rack-mounting cabinet, provides the proper electrical environment

for the instrument, supplies adequate shielding, minimizes handling

damage, and reduces dust collection within the instrument.

Rack-Mounting

The 1780R-Series rack-mounting cabinet is designed for permanent

mounting. The instrument slides in and out of the cabinet with

relative ease. The instrument is secured in the cabinet with four 6–32

TORXR drive screws. See Figure 1–1.

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Getting Started

Figure 1–1: Location of the four screws that secure the instrument to

rack-mounting cabinet or portable case

WARNING. Do not attempt to carry a cabinetized instrument without

installing the rear-panel mounting screws. There is nothing to hold

the instrument in the cabinet if it is tipped forward.

Table 1–1: Rack-Mounting Hardware Included

Qty

Description

Part Number

407-3752-00

381-0251-00

212-0577-00

210-1061-00

Bracket, Extension: 2.5 X 8.06 X 0.06, Steel

Nut Bar: (3) 10-32 X 3.0 X 0.375 X 0.125, Aluminum

Screw, Machine: 10-32 X 0.625, Steel

Washer, Flat: 0.203 ID X 0.625 OD X 0.062, Steel

A front clearance of at least 18 inches is required for removing the

instrument from the rack. BNC connectors on the rear panel extend

approximately 0.6 inches, making it necessary to have 1 inch or

more of rear clearance to have enough room to cable the instrument.

See Figure 1–2 for rack-mounting dimensions.

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Getting Started

Figure 1–2: Dimensions used for rack-mounting the 1780R-Series Video

Measurement Set

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Getting Started

Figure 1–3: Dimensions of the adjustable rear rack-mounting bracket

To install the instrument in the rack: First remove the four securing

screws and take the instrument out of the rack-mounting cabinet.

(All 1780R-Series instruments are shipped in the rack-mounting

cabinet to provide extra shipping protection.) Once the instrument is

out of the cabinet, mount the front of the cabinet in the rack, using

four 10–32 TORXR screws. Cabinet front slots are spaced, and wide

enough, to accommodate standard racks. Next, mount the adjustable

brackets to the rear rack section. See Figure 1–3 for bracket

dimensions. Then mount the adjustable brackets to the rack-mount

cabinet using four 10–32 TORXR screws, four number 10 flat

washers, and the nut bars. See Figure 1–4 for more assembly detail.

Finally, re-install the four 6–32 screws that secure the instrument to

the rack-mounting cabinet. See Figure 1–1.

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Getting Started

Figure 1–4: Installing rear rack-mounting brackets for rack applications

of depths from 18 to 24 inches

NOTE. For ease of installation, place the nut bars to the outside of

the adjustable brackets and drive the screws from the center into the

nut bars.

For applications where it is necessary to rack-mount the instrument,

but have it removable with the instrument case, order the 1780F05

Rack-Mount Shelf.

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Getting Started

Options

The 1780R-Series is shipped with a standard U.S. plug, or can be

ordered with one of the following options.

Option A1 (220 V, European plug)

Option A2 (240 V, United Kingdom plug)

Option A3 (240 V, Australian plug)

These are the only options currently available for the 1780R-Series.

Part numbers are listed in Section 6.

Standard Accessories

The following accessories are shipped with the 1780R-Series. Part

numbers are listed in Section 6.

1780R-Series Operator’s Manual

Cable, Power (Standard, Opt A1, A2, or A3)

Filter, Air

Graticule, 511-1979, Visual (1780R ONLY)

Graticule, 511-1979, Photographic (1780R ONLY)

Graticule, K-Factor, Visual (1781R ONLY)

Graticule, K-Factor, Photographic (1781R ONLY)

Graticule Lamp, Incandescent

Replacement Cartridge Fuse, 2 A Slow Blow

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Getting Started

Optional Accessories

The following is a list of the most common accessory items for the

1780R-Series. Part numbers, if applicable, are listed in Section 6.

1780R-Series Service Manual

Viewing Hood

Portable Cabinet

Extender Kit for Oscillator and Z-Axis Circuit Boards

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Connectors, Controls, Indicators

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Connectors, Controls, Indicators

This section provides an overview of control and connector

functions. To locate more detailed information, please refer to the

manual index or table of contents.

Switches

Push and release the front-panel switches to toggle between

selections. Push and hold to access outlined selections.

Companion Switches

Some switch functions are paired or grouped so that two or three

switches determine one display. These are referred to in this manual

as companion switches.

Pushing the same companion switch twice in succession will change

its selection (as indicated by the LED).

Pushing first one companion switch and then another will cause the

display to alternate between the first switch selection and the second

switch selection. Held functions will be forced to the top function of

the switch. For example, VECT and SCH together reverts to VECT.

Controls

All front-panel controls are continuous except the Horizontal

Position control, which has stops. It also has a spring return which

returns it to the center position. The further from center the control is

turned, the faster the display moves. This is useful in MAG

operation.

The five CRT controls (Focus, Scale, Intens, VPOS, and HPOS) are

used to adjust both CRTs. Refer to CRT Controls for details.

LEDs

Green LEDs indicate front-panel switch selections. Some LEDs are

located next to the function label, and some are located in the switch

itself.

Red LEDs indicate an uncalibrated gain condition.

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Connectors, Controls, Indicators

Audio Feedback (Beep)

A Beep Sounds When:

The limit of a front-panel control range has been reached.

An attempt is made to change a locked setting.

An attempt is made to access an invalid condition, such as a Parade

display in 1-line mode.

Disable the Beep

Selecting Beep Off in the Configure menu will disable the beep for

all cases except touch screen selection.

A “Click” Occurs When:

A touch screen selection is made. (Click cannot be disabled.)

Touch Screen

Both CRTs are equipped with 4 × 4 (four vertical and four horizontal

divisions) LED matrix touch screens to provide menu access to

additional instrument functions.

Selections are made by touching the desired function on the CRT

screen.

Instructional labels, such as SELECT MEASUREMENT, are shown

on the CRT screen in italics.

Touching the CRT screen is indicated in this manual by the use of

the word ‘touch’ (as opposed to ‘push’ for front-panel switches).

A “click” indicates that a touch screen selection has been made.

If two or more choices are available, the current selection will be

outlined on the screen.

If a menu choice is not displayed, nothing will happen when the

screen is touched.

A circle around a menu choice indicates the current assignment of

the large knob.

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Connectors, Controls, Indicators

Front-Panel Controls

NOTE. Locations for the following controls are shown in Figure 2–1.

Power

1. POWER. The Power push-button switch turns the instrument on

or to standby status, and displays a colored spot inside the switch

when power is on.

CRT Controls

The five CRT controls (Focus, Scale, Intens, VPOS, and HPOS) are

used to adjust both CRTs. Assignment of these controls from one

CRT to the other is controlled by two illuminated switches, one

under the left CRT and one under the right CRT.

When <TIMEOUT> <ON> is selected (Configure menu, described

in Section 3), vectorscope assignment of CRT controls will revert to

waveform assignment after 30 seconds of no knob activity.

The settings of the five CRT controls are saved and restored when

toggling between waveform and vector assignments.

2. Left switch. This switch assigns the Focus, Scale, Intensity, and

Position controls to operate with the left (vectorscope) CRT.

3. Right switch. This switch assigns the Focus, Scale, Intensity, and

Position controls to operate with the right (waveform monitor)

CRT.

4. SCALE. The Scale control adjusts the level of graticule

illumination. A beep indicates the limits of the control range.

5. FOCUS. The Focus control adjusts the beam for optimum

definition. A beep indicates the limits of the control range.

6. INTENS. The Intensity control adjusts display brightness. A beep

indicates the limits of the control range.

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Connectors, Controls, Indicators

Figure 2–1: Left side of front panel

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Connectors, Controls, Indicators

7. VERT POS. Use the Vertical Position control to move the display

up and down. A beep indicates the limits of the control range.

(Positioning range is greater for waveform monitor than for

vectorscope.)

8. HORIZ POS. Use the Horizontal Position control to move the

display left and right. Below SNs B020245 only, this is a spring

activated control; turn the control more to move the display

faster. A beep indicates the limits of the control range. (Position-

ing range is greater for waveform monitor than for vectorscope.)

Precision Measurement (Large Knob)

NOTE. Detailed measurement information is located in Section 4.

The TIME and VOLTAGE CURSORS, PHASE SHIFT, and LINE

SELECT switches are enabled by pushing the corresponding switch,

and exited by pushing that switch again.

While any of these modes is enabled, rotating the large knob

provides continuous adjustment, and pushing the < > buttons

provides single-step adjustment.

Two, three, or all four of these functions can be enabled at once.

Separate readouts are provided for each function. Large knob

assignment is determined by the last function button pushed, and can

be changed by touching the desired readout area of the CRT screen.

Current assignment is circled.

NOTE. Detailed Timing and Voltage Cursor information is located in

Section 3.

9. TIME CURSORS. This switch enables the timing cursors. The

Timing Cursor menu on the vectorscope CRT provides a choice

of cursors that track together or are positioned separately, and a

choice between locate and measure.

The readout indicates the time difference between Cursor One

and Cursor Two, in increments of 5 nanoseconds. If magnifica-

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Connectors, Controls, Indicators

tion or variable sweep is selected, the cursor interval is magnified

correspondingly.

To change the large knob assignment from one cursor to another,

touch the quadrant labeled <CURSOR 1 / CURSOR 2>. The

current assignment is outlined by a box.

Timing cursors are not valid in Field mode.

For software versions 1.13 and up, installed in instruments SN

B020100 and up: Refer to (11) LINE SELECT for information on

Timing Cursors in Line Select mode.

NOTE. Detailed Timing and Voltage Cursor information is located in

Section 3.

10. VOLTAGE CURSORS. This switch enables the voltage cursors.

The Voltage Cursor menu on the vectorscope CRT provides a

choice of cursors that track together or are positioned separately,

and a choice between absolute and relative readout. Cursor One

appears as a dashed horizontal line, and Cursor Two as a series of

two short dashes on the waveform monitor display. If vertical

gain is employed, the cursor interval is magnified accordingly.

To change the large knob assignment from one cursor to another,

touch the quadrant labeled <CURSOR 1 / CURSOR 2>. Current

assignment is outlined by a box.

11. LINE SELECT This switch enables the line select function,

which is available for both waveform and vectorscope. For

waveform display, the selected line is displayed first in a multiple

line display, and brightened in a field display. Alpha-numeric

readout indicates the selected line and field on both CRTs.

Additional line select information can be found in Section 3.

Full measurement functions are available in Line Select mode.

Large knob assignment is indicated by a circle, and is selected by

touching the line number area on the desired CRT screen.

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Connectors, Controls, Indicators

Different lines can be displayed on the waveform and vector-

scope CRTs, when that function is selected via the Line Select

menu by touching <WFM = VECT> until <NO> is outlined.

For software versions 1.13 and up, installed in instruments SN

B020100 and up: For ease in viewing the Timing Cursors while

in Line Select mode, the Timing Cursor dots are positioned on

the Voltage Cursors. Upon entering Line Select mode with

Timing Cursors on, the Voltage Cursors are automatically

enabled.

For software versions 1.13 and up: A dual Line Select mode is

available for making ICPM measurements when in Line Select. It

is described in Section 4, under ICPM Measurement.

12. PHASE SHIFT. This switch enables the precision phase shift

measurements. Phase readout appears in the upper left corner of

the vectorscope CRT. This readout changes as the phase is

shifted. For SCH operation, the phase ranges from 180_ to 180_.

For Vector, the configure menu offers a choice of two phase

displays: 180_ to 180_ or 0_ to 360_.

13. REFERENCE SET. This switch is used in Phase Shift, Voltage

Cursor, and Line Select modes. In Phase Shift, it stores the

currently displayed phase as a reference and resets the readout to

0.00. In Voltage Cursor mode with <RELATIVE> selected, it

stores the currently displayed voltage as a reference and resets

the readout to 100% (0 dB). In Line Select mode, it is used to

access the vertical interval (line 19).

14. KNOB. The Precision Measurement control (large knob) operates

with selected functions to provide continuous adjustment.

15. < > These switches operate with selected functions to provide

single-step adjustment. The readout increments are the same as

those for the Precision Measurement Control.

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Connectors, Controls, Indicators

Menu Access Switches

NOTE. Detailed menu information is located in Section 3.

16. PRESET. This switch provides access to the Preset menu screen,

which allows the user to store, recall, and name up to 12

complete instrument setups.

17. MEASURE. This switch provides access to the Measurement

menu screen. Selections, made by touching the screen, are: DIFF

PHASE, DIFF GAIN, DP & DG, NOISE, ICPM, K FACTOR,

CHROMA/LUMA, SHORT TIME DISTORTION, RY SWEEP,

BOWTIE, and FSC TIME MARKS. Measure menu selections,

including user-modified instrument configuration, can be stored

and recalled through the Preset menu. When a preset containing a

measurement mode is recalled, the instrument will automatically

reenter that measurement mode.

18. CONFIGURE. This switch provides access to the Configure

menu. This is a three-page menu; touch <PAGE> to sequence

through the pages. Configure menu settings include units of

measure, probe input, DC restorer, int / ext graticules, 75% /

100% color bars, calibrator amplitude, etc.

19. CALIBRATE. This switch provides access to the Calibration

menu, which toggles between waveform and vectorscope when

the buttons under the CRTs are pushed. Specified instrument

parameters can be set, using either the internal calibrator signal

or an input signal for reference.

Waveform Calibrate menu selections are: CAL SIGNAL

ON/OFF, VOLT CURSORS ZERO SET, CAL AMPL ZERO

SET, HORIZ POS KNOB CAL, EXT HORIZ CAL, HORIZ

CAL, TRACE ROTATION, READOUT INTENSITY, and VERT

CAL.

Vectorscope Calibrate menu selections are CAL OSC ON/OFF,

TRACE ROTATION, READOUT INTENSITY, and GAIN CAL.

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Connectors, Controls, Indicators

Probe

20. BNC Connector. This is the input connector for a X1 or X10

probe.

21. CAL OUT. This pin jack outputs the calibration signal used to

compensate the X10 probe. DC Restorer must be OFF (page 1 of

the Configure menu) and EXT REF must be selected.

Display Mode

Companion Switches. Some switch functions are paired or grouped so

that two or three switches determine one display. These are referred

to in this manual as companion switches.

Pushing the same companion switch twice in succession will change

its selection (as indicated by the LED).

A Held mode will be exited when its companion switch is pushed,

and then the HELD switch is (momentarily) pushed again. The

switch setting will revert to the last selection before the Held mode

was entered.

Pushing first one companion switch and then another will cause the

display to alternate between the first switch selection and the second

switch selection.

NOTE. Some switches may be locked out by menu selections.

Companion Switch Example. VECT / SCH and XY / PIX are used to

select vectorscope CRT displays.

Push and release the VECT/SCH switch to select Vector. It will

require one or two pushes.

Now push and release the XY / PIX switch to select XY.

Push the VECT / SCH switch. Note that it is restored to Vector.

Push the XY / PIX switch. Note that it is restored to XY.

Push the XY / PIX switch a second time. Now it toggles to PIX.

Push the VECT / SCH switch twice. Now it toggles to SCH.

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Connectors, Controls, Indicators

Figure 2–2: Right side of front panel

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Connectors, Controls, Indicators

NOTE. The following switch groups are companion switches:

VECT / SCH & XY / PIX, PARADE / OVERLAY & WAVEFORM/

WFM + CAL.

Refer to the preceding instructions entitled Companion Switch

Example. Locations of the switches are shown in Figure 2–2.

22. VECT / SCH. Push and release this switch to toggle between

Vector and SCH phase display for the vectorscope CRT. Push and

hold to access SCH phase and Vector together.

23. XY / PIX. Push and release this switch to toggle between XY and

Picture Monitor display for the vectorscope CRT. Push and hold

to add XY to the current VECT / SCH selection. Push and release

to exit held mode.

24. PARADE / OVERLAY. Push and release this switch to toggle

between Parade and Overlay modes. Possible configurations are

shown in Table 2–1.

Table 2–1: Possible Parade and Overlay Configurations

Display

Possible Inputs *

Automatic Selections

Parade

No access beep sounds. If ONE LINE is selected in Overlay or

Waveform mode, instrument reverts to

TWO LINE or THREE LINE when

ONE LINE

Parade is selected.

TWO LINE

CH A and Probe, or

CH B1 and Probe, or

CH A and CH B1, or

CH B1 – CH B2 and

CH B1 – CH B3 (Bow-

tie)

If CH B1, CH B2, and CH B3 are

selected, the instrument will revert to

THREE LINE mode.

THREE LINE

CH B1 and CH B2 and

CH B3

If any combination of two input

channels is selected, the instrument

will revert to TWO LINE mode.

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Connectors, Controls, Indicators

Table 2–1: Possible Parade and Overlay Configurations (Cont.)

Display

Possible Inputs *

Automatic Selections

Overlay

CH B1 and CH B2, or

CH B1 and CH B3, or

CH B2 and CH B3, or

CH A and Probe, or

Probe and CH B1, or

CH A and CH B1, or

CH B1 and CH B2 and

CH B3

If TWO LINE or THREE LINE opera-

tion is selected, instrument will revert

to ONE LINE or FIELD operation

when Overlay is selected.

ONE LINE or

FIELD

Other combinations not permitted, and will cause a beep to sound.

25. WFM / WFM+CAL. Push and release this switch to toggle

between standard waveform display and waveform plus calibrator

signal.

Ref

26. INT / EXT / CW. This switch toggles between an internal signal

(incoming video) and an external signal (rear-panel input) for

sync and subcarrier reference. Push and hold this switch to select

the rear-panel CW input as a subcarrier reference. The LED will

indicate whether CW Sync has been set for internal or external

(via the Configure menu, page 3).

27. LINE / FIELD. Push and release to toggle between LINE and

FIELD. Line and Field combinations are limited only when in

Overlay and Parade modes. See Table 2–1.

Wfm Horizontal

28. ONE / TWO / THREE. Push and release to toggle between ONE

and TWO. Push and hold to select THREE. The Line and Field

combinations are limited only when in Parade or Overlay mode,

as shown in Table 2–1.

Magnifier

29. ON >. Push and release to turn on the magnifier, then push again

to increase magnification. Push and hold to turn on the magnifier

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Connectors, Controls, Indicators

and continuously increase the magnification factor. Magnifica-

tion factors are shown in Table 2–2.

Table 2–2: Waveform Magnification

msec/Div

2 Line

> Button

Setting

Magnification

Factor

1 Line

3 Line

Off

5.0 ms

10.0 ms

2.0 ms

15.0 ms

3.0 ms

One Push

Two Pushes

Three Pushes

Four Pushes

Five Pushes

Six Pushes

1.0 ms

X10

X20

X25

X50

X100

0.50 ms

0.25 ms

0.20 ms

0.10 ms

0.05 ms

1.0 ms

1.50 ms

0.75 ms

0.60 ms

0.30 ms

0.15 ms

0.50 ms

0.40 ms

0. 20 ms

0.10 ms

30. OFF <. Push and release to decrease magnification (up to six

steps). Turns off the magnifier when pushed enough times, or

when held.

31. VAR / SLOW (Switch). This switch toggles between Variable

Sweep, Slow Sweep, and Off (calibrated sweep).

32. SWEEP RATE (Control). Use the knob to control the sweep rate

when VAR is selected, and sweep duration when SLOW is

selected. VAR and SLOW control settings are saved and

reinstated each time the mode is entered. To return to calibrated

sweep, push the VAR/SLOW button until the red LEDs are off.

Gain

33. VAR / X5 (Switch). This switch controls the waveform monitor

vertical gain. Push and release to toggle through variable gain,

X5 gain, and off. The waveform knob controls the amount of

variable gain when VAR is selected. Push and hold to enable both

X5 and Variable Gain.

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Connectors, Controls, Indicators

34. WAVEFORM (Control). Use this knob to control the amount of

variable gain when VAR is selected.

35. VECTOR (Control). Use this knob to control the amount of

variable gain when VAR is selected.

36. VAR / MAX (Switch). Push and release this switch to turn on the

vectorscope variable gain, which is controlled by the Vector

knob. Push and hold to disable the variable and set the vector-

scope gains to maximum.

Filter

NOTE. The following switch groups are companion switches: AUX /

DIFF / LPASS & FLAT / LUM / CHROM

Refer to the preceding instructions entitled Companion Switch

Example.

37. AUX / DIFF / LPASS. Push and release this switch to toggle

through the following selections: Aux Video In (signal is input

after the video filters), Differentiated step (linearity steps are

translated into spikes for amplitude comparisons), and Low-pass

filter (300 kHz bandwidth).

38. FLAT / LUM / CHROM. Push and release this switch to toggle

through the following selections: Flat (unfiltered video signal),

Luminance (chrominance filtered out), and Chrominance

(luminance filtered out). Push and hold to select a multiple filter

display, described in Table 2–3.

Table 2–3: Multiple Filter Displays

Display

Possible Switch Settings

ONE LINE or FIELD

TWO LINE or FIELD

Flat/Lum overlay.

Flat filtered displayed first (left portion of screen), then

luminance filtered.

THREE LINE or FIELD

Flat filtered displayed first, followed by luminance filtered

and chrominance filtered.

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Connectors, Controls, Indicators

NOTE. The three INPUT switches are companion switches. Refer to

the preceding Companion Switch Example.

Input

39. A–B1 / B1–B2 / B1–B3. This switch selects from the following

inputs for display: CH A minus CH B1, CH B1 minus CH B2, or

CH B1 minus CH B3. Push and hold this switch to select CH B1

minus CH B2 and CH B1 minus CH B3 together (Bowtie).

Instrument will be forced to 2-Line Parade operation.

40. CH B1 / CH B2 / CH B3. In WFM mode, push and release this

switch to select the rear-panel Channel B1, Channel B2, or

Channel B3 input for display on both CRTs. In Parade mode, all

three are forced on. In Overlay, it selects any two or all three

input channels on. Refer to Table 2–4 for an outline of possible

switch settings.

Table 2–4: Possible CH B1, CH B2, CH B3 Switch Settings

Display

Possible Switch Settings

Overlay

Toggles between 2 channels and all 3 channels on.

ONE LINE or FIELD

Waveform

TWO LINE or FIELD

Parade

THREE LINE or FIELD

Waveform

THREE LINE or FIELD

Toggles to select any one channel.

CH B1, CH B2, and CH B3 on together

Toggles to select any one channel.

(Push & Hold)

41. CH A / PROBE. This switch selects the rear-panel Channel A

input or the front-panel Probe input for display on both CRTs.

Upon entering the Probe mode, the following message appears:

“PROBE– – 50V DC MAX.”

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Connectors, Controls, Indicators

Rear Panel Connectors

Connectors CH A, CH B1, CH B2, CH B3, EXT REF, and CW are

high impedance bridging loop-through inputs. CH A, CH B1,

CH B2, and CH B3 have either a grounded or floating shield,

depending on the position of the grounding screw, which is located

between the BNC connectors.

The following connector locations are shown in Figure 2–3.

1. CH A. CH A accepts composite or component video signals.

2. CH B1. CH B1 accepts composite or component video signals.

3. CH B2. CH B2 accepts composite or component video signals.

4. CH B3. CH B3 accepts composite or component video signals.

5. XY INPUT. XY is a 15-pin D-type connector used as a high

impedance input for the 600 W balanced audio. XY operation is

described in Section 3. The connector pinout is shown in Figure

3–5 on page 3–11.

6. EXT CW REF. CW connector accepts input for continuous

subcarrier signal. Provides an external phase reference signal.

7. LINE STRB OUT. LINE STRB OUT is a TTL output that

provides a negative-going pulse for the selected line(s) when

Line Select is used. When Line Select is off, the output level is

low.

8. AUX OUT. AUX OUT provides a 75 W video signal output

before filtering. AUX OUT can be used with the AUX IN to use

custom filters.

9. PIX MON OUT. PIX MON OUT connector provides a 75 W

output to drive a picture monitor. The signal is output before

filtering, and has a bright-up pulse added when Line Select is

used.

10. AUX IN. AUX IN provides a 75 W input for video signals to the

waveform monitor. Signal is inserted after the internal filters.

11. EXT REF. External Reference connector accepts either

composite sync or black burst.

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Connectors, Controls, Indicators

Figure 2–3: Rear-Panel Connectors

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Connectors, Controls, Indicators

12. EXT HORIZ. The EXT HORIZ input connector allows external

control of waveform monitor sweeps. A positive-going signal

deflects the sweep from left to right. A 0 V to +5 V signal is

required for full scale deflection (ICPM).

13. SERIAL PORT. This 9-pin D-type connector provides a serial

remote control interface, compatible with both RS232 and RS422

standards. Serial Port communications are described in Section 3.

The connector pinout is shown in Figure 3–9 on page 3–18.

14. REMOTE. This 15-pin D-type connector provides a ground

closure remote control interface and signal inputs for Remote

Sync and RGB/YRGB. Remote operation is described in

Section 3. The connector pinout is shown in Figure 3–8 on

page 3–15.

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Operating Instructions

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Operating Instructions

Large Knob And Associated Switches

Timing Cursors

Push the TIME switch to enable the timing cursors and obtain a

menu on the vectorscope CRT. Use this menu to choose cursors that

track together or are positioned separately, and to choose between

locate and measure.

When <SEPARATE> is selected by touching the <SEPARATE/

TRACK> area of the screen, the large knob moves Cursor One or

Cursor Two, depending on which cursor is selected (outlined). When

<TRACK> is selected, the large knob moves both cursors at the

same time.

The two cursors appear as bright-up portions of the waveform

display when <LOCATE> is selected, or as bright-up dots when

<MEASURE> is selected. The readout indicates the time difference

between Cursor One and Cursor Two, in five nanosecond intervals.

If magnification or variable sweep is selected, the cursor interval is

magnified correspondingly. Time difference between Cursor One and

Cursor Two can be determined, even though they may not both be on

screen at the same time.

To change the large knob assignment from one cursor to another,

touch the quadrant labeled <CURSOR 1 / CURSOR 2>. The current

assignment is outlined by a box.

Cursors appear to “wrap around” in One Line and Two Line sweeps

because the total cursor range (160 ms) extends beyond the One or

Two Line sweep length. A beep sounds at both ends of the range.

Time difference between Cursor One and Cursor Two can be

determined, even though they may not both be on screen at the same

time.

Pushing REFERENCE SET has no effect while Timing cursors are

enabled.

Timing cursors are not valid in Field modes.

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Operating Instructions

For software versions 1.13 and up, installed in instruments SN

B020100 and up: The Timing Cursor dots are positioned on the

Voltage Cursors while in Line Select mode, for ease in viewing the

Timing Cursors.

Voltage Cursors

Push the VOLTAGE switch to enable the voltage cursors and obtain

a menu on the vectorscope CRT. Use this menu to choose cursors

that track together or are positioned separately, and to choose

between absolute and relative readout.

Cursor One appears as a dashed horizontal line, and Cursor Two as a

series of two short dashes on the waveform monitor display.

The large knob provides continuous adjustment of cursors. The < >

buttons provide adjustment in discrete steps of 0.1 IRE or 1mV

(depending on the Configure menu ABS UNITS selection).

To change the large knob assignment from one cursor to another,

touch the quadrant labeled <CURSOR 1 / CURSOR 2>. The current

assignment is outlined by a box.

When <SEPARATE> is selected by touching the <SEPARATE /

TRACK> area of the screen, the cursors are moved one at a time

(currently selected cursor is outlined). When <TRACK> is selected,

both cursors move at once.

When <ABSOLUTE> is selected, the readout (in IRE or mV)

indicates the voltage difference between the two cursors. The mV /

IRE selection is made through page 2 of the Configure menu. The

Configure menu instructions appear later in this section.

REFERENCE SET has no effect in Absolute mode.

When <RELATIVE> is selected, the readout is shown in percent and

dB, relative to the value when REFERENCE SET was last pushed.

REFERENCE SET resets the relative value to 100.0% (0 dB).

If vertical gain is employed, the cursor interval is magnified

correspondingly. Voltage difference between Cursor One and Cursor

Two can be determined, even though they may not both be on screen

at the same time.

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Operating Instructions

For software versions 1.13 and up, installed in instruments

SN B020100 and up: Voltage cursors are automatically enabled when

in Line Select with Timing Cursors.

Line Select

This switch enables the line select function, which is available for

both waveform and vectorscope. For waveform display, the selected

line is displayed first in a multiple line display, and brightened in a

field display. Alpha-numeric readout indicates the selected line and

field on both CRTs.

In software versions 1.11 and up, a 1 of 8 Field reference is

provided, for use with ghost-cancelling signals. In NTSC, the 8 Field

reference is built from two groups of 4 Fields. Touching <ALT

FIELD> will toggle between the two groups as a starting point for

the 8 Field reference.

When 2 of 4 Field reference is selected, the <FIELD> area in the

lower right corner of the screen will toggle between Fields 1 and 3 or

Fields 2 and 4; when 1 of 4 is chosen, it will allow selection of Field

1, 2, 3, or 4; and when 1 of 8 (present in software versions 1.11 and

up) is chosen, it will allow selection of Field 1, 2, 3, 4, 5, 6, 7, or 8.

The selected field or field pair is boxed. When <ALL> Fields is

selected, the <FIELD> area is no longer present in the lower right

corner of the screen, and all fields are overlaid.

To enable the Line Select menu, first push the LINE SELECT

front-panel button, then touch <LSEL MENU> on the vectorscope

CRT until <ON> is outlined. To exit the menu, push the same area

again until <OFF> is outlined.

Line Select menu choices are shown in Figures 3–1 and 3–2. Touch

desired area to toggle between choices. Current selection is outlined

by a box.

Touch <VECT 1H/15H> or <WFM 1H/15H> to display the selected

line (<1H>) or display the selected line plus the next 14 overlaid

(<15 H>).

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Operating Instructions

Figure 3–1: Line Select Menu Screen with <2 OF 4> Fields selected

The waveform and vectorscope CRTs can be used to display the

same selected line or different lines. To display different lines,

enable the Line Select menu, then touch <WFM = VECT> until

<NO> is outlined. Be sure that both <VECT LSEL> and <WFM

LSEL> show <ON> outlined. Touch <LINESEL MENU> again, so

that <OFF> is outlined and the menu is no longer displayed on the

vectorscope CRT.

When different lines are displayed on waveform and vectorscope

CRTs, touch the line number area on the desired CRT to change the

large knob assignment. This assignment is indicated by a circle.

To display the same line on both CRTs, select <WFM = VECT> and

<YES>. The line number will be circled on both CRTs.

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Operating Instructions

Figure 3–2: Line Select Menu Screen with <1 OF 8> Fields selected

For software versions 1.13 and up: A dual Line Select mode is

available for making ICPM measurements when in Line Select. It is

described in Section 4, under ICPM Measurement.

Phase Shift

This switch enables precision phase shift measurements. Phase

readout appears in the upper left-hand corner of the vectorscope

CRT.

This readout changes as the phase is shifted, indicating the degrees

of change since the phase reference was set.

Reference Set

This switch is used in Phase Shift mode, to store displayed phase as a

reference and reset the readout to 0.00; in Voltage Cursor mode with

<RELATIVE> selected, to store the displayed voltage as a reference

and reset the readout to 100%; and in Line Select mode to access the

vertical interval (line 19).

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Operating Instructions

Knob

The Precision Measurement control (large knob) provides analog

precision adjustments associated with the REFERENCE SET, LINE

SELECT, PHASE, TIMING CURSOR, and VOLTAGE CURSOR

switches, or as assigned by menu selections.

The current function of this knob is circled on the CRT screen.

< > Switches

The < > switches provide single-step increments. The readout

increments are the same as those for the Precision Measurement

Control readout. Push and release for an individual increment, or

push and hold to continue increments.

Graticules

This section describes the basic vector and waveform graticule

markings for both the 1780R (NTSC), and 1781R (PAL) instruments.

Scale Illumination for Vector and Waveform Graticules

The choice of internal or external graticule illumination is provided

on page 2 of the Configure menu. Refer to the Configure menu

instructions in this section. To adjust scale illumination, push the

button under the vectorscope or waveform CRT (to assign CRT

controls to vectorscope or waveform), then adjust the SCALE

control as desired.

Using The Vector Graticule

Basic Vector Graticule Markings. The NTSC Vector graticule is shown

in Figure 3–3. The polar display permits measurements of hue in

terms of the relative phase of the chrominance signal with respect to

the color burst. Relative amplitude of chrominance to burst is

expressed in terms of the displacement from center (radial dimension

of amplitude) towards the color point which corresponds to 75% (or

100%) amplitude for the color being measured.

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Operating Instructions

Figure 3–3: 1780R Vector Graticule

The graticule includes four burst amplitude marks: 75% with setup,

75% with no setup, 100% with setup, and 100% with no setup.

On the NTSC graticule, each chrominance vector terminates in a

system of graticule targets in the form of two boxes (a small box

inside a large box). The dimensions of the large boxes represent

±10_ centered on the exact chrominance phase, and ±20% of

chrominance amplitude centered around 100% of standard

amplitude. The dimensions of the smaller boxes represent ±2.5_ and

±2.5 IRE.

The PAL Vector graticule is shown in Figure 3–4. On the PAL

graticule, each chrominance vector related to the +V burst terminates

in targets that are in the shape of two boxes (a small box inside a

large box). The dimensions of the large box represent ±10_ centered

on the exact chrominance phase and ±20% of chrominance

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Operating Instructions

amplitude centered around 100% standard amplitude. The dimen-

sions of the smaller inner target represent ±3_ and ±5% of chromi-

nance amplitude. Note that the chrominance vectors associated with

the –V burst are terminated in the smaller targets only.

Figure 3–4: 1781R Vector Graticule

On the NTSC graticule, the small marks at intervals along the I and

Q axes denote the amplitudes of the chrominance components. On

the PAL graticule, the small marks at intervals along the U and V

axes denote the amplitudes of the U and V chrominance components.

The horizontal and vertical axes of the vector graticule contain

markings for checking Vector mode bandwidth. A subcarrier

frequency sine wave whose amplitude places it on the outer compass

rose is used as a reference. When the frequency is changed, the

diameter of the circle should reduce. At a point equal to 70% of full

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Operating Instructions

amplitude (3 dB), there are gaps in the horizontal and vertical axes.

This calibration aid makes it possible to check the –3 dB points of

the demodulator output amplifiers.

Differential Gain and Phase Measurements. The 1780R-Series provides

differential gain and phase measurements through the Measurement

menu, accessed by pushing the front-panel MEASURE button.

Instructions are given in Section 4.

The 1780R-Series vector graticule is the same as the 1720-Series

vector graticule, and provides differential gain and phase markings,

so that approximate 1780R-Series measurements can also be made in

the same way as with the 1720. Differential gain (dG) and differen-

tial phase (dF) measurements can be made using the graticule

markings located at the outer edge of the B–Y axis (NTSC) or U axis

(PAL).

Differential gain appears as an elongation of the chrominance dot.

Measure the horizontal distance from end to end. Minor graticule

divisions represent 5% error, and major divisions represent 10%.

Differential Phase appears as a vectorial offset of the chrominance

dot. Measure angular difference, using the Differential Phase

graticule markings along the edge of the compass rose. Measuring

from the 0_ mark on the B–Y or U axis, each minor division

represents 2_ of error, the major divisions represent 10_, and the

dashed lines half-way in between represent 5_ of Differential Phase

error.

XY Measurements. The 1780R-Series vectorscope graticule contains

markings for measuring stereo audio phase and amplitude. The

dashed diagonal line is the measurement axis for errors less than

90_, and is terminated in amplitude targets that correspond to the

length of the X and Y axes. These target boxes, in the upper right

and lower left of the display, correspond to amplitude errors of 1/2

and 1 dB.

The upper half of the Y axis has markings in 10_ increments for

measuring the separation of the Lissajous. Both X and Y axes have

–3 dB markings, making it easy to check the bandpass of the

amplifiers. The 3 dB points are minor breaks in the line about 30%

of the distance from the graticule circle to the graticule center.

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Operating Instructions

XY INPUT Connector. The rear-panel XY INPUT connector is a 15-pin,

sub-miniature, D-type connector that provides input to the

Horizontal and Vertical (X and Y) Amplifiers. They are balanced

(differential), DC-coupled, high impedance (>20 kW), un-terminated

inputs provided for audio applications. If AC coupling is desired,

external capacitors are required. These inputs are factory calibrated

for 0 dBm in 600 W but can be adjusted for any 600 W system

between 0 and 12 dBm. See Figure 3–5.

0 dBm is equal to 1 mW or 2.19 V peak-to-peak in 600 W. 12 dBm is

equal to 15.8 mW or 8.72 V peak-to-peak in 600 W.

To calibrate the 1780R-Series for a system other than 0 dBm,

perform step 38 of the Adjustment Procedure in the 1780R-Series

Service Manual, using a 1 kHz sine wave of the appropriate

amplitude.

Inputs can be driven single-ended by driving either the + or – X and

Y inputs with the opposite polarity inputs grounded.

In addition, a single-ended, high-gain mode can be used for other,

primarily non-audio, applications. It can be accessed by installing

plug jumpers on J108 and J205 (on the Vectorscope board, see

Table 3–1) and inputting the signal on the +X and +Y inputs with the

–X and –Y inputs grounded.

Table 3–1: Plug Jumpers for Vectorscope Board

Jumper

Name

Plug Position

Purpose

Number

J108

X Input Gain

X gain is normal

Removed {

X gain is in High Gain

position

Installed

J205

Y Input Gain

Y gain is normal

Removed {

Y gain is in High Gain

position

Installed

{

Factory installed position.

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Operating Instructions

Pin Number

Function

–X Input

No Connection

+X Input

No Connection

–Y Input

No Connection

+Y Input

No Connection

–X Input

Ground

+X High Gain Input

Ground

–Y Input

No Connection

+Y High Gain Input

Figure 3–5: Rear-panel X–Y Connector Pin Assignments

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Operating Instructions

Using The Waveform Graticule

Basic Waveform Graticule Markings. The two basic 1780R-Series

internal waveform graticules are the NTSC and PAL graticules. The

NTSC graticule is shown in Figure 3–6, and the PAL graticule is

shown in Figure 3–7. External graticules (short time distortion for

NTSC and CCIR / K-factor for PAL) are also available in full scale

and in a 3% reduced photo version.

Figure 3–6: 1780R Waveform Graticule

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Operating Instructions

Figure 3–7: 1781R Waveform Graticule

Graticule horizontal scales are divided into 12.7 divisions along the

horizontal line at blanking level. The vertical graduations are scaled

according to measuring units and ranges unique to each system – mV

for the CCIR graticule, and IRE units and percent modulation for

NTSC. A mV scale has been added to the NTSC graticule to

facilitate component measurements. The graticules are also marked

for K-factor tolerances and linear-distortion measurements.

Line-time distortion-NTSC. Line-time distortion is measured using the

graticule box labeled L.D. = 2%, 5%. Any test signal that contains

an 18 ms, 100 IRE bar can be used. To make a measurement, select a

one-line sweep and use the two arrows on the 50 IRE line to position

the bar horizontally. Make sure that the blanking level of the

waveform is on the baseline, and that the bar top passes through

100 IRE at its midpoint. (It may be necessary to use the variable gain

control to normalize the gain.) The box excludes the first and last ms

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Operating Instructions

of the bar. Use the ±2% and ±5% graticule marks to quantify the

peak-to-peak deviation of the bar top (tilt or rounding) within the

structure. The vertical gain can be increased to measure small errors.

(When the X5 setting is selected, the graticule marks correspond to

±0.4% and ±1%.)

Line-time distortion measurements can also be made using the

voltage cursors in the RELATIVE mode. Define the amplitude

difference between blanking level and the bar center as 100%. Now

move both of the cursors to measure the peak-to-peak tilt. This

number is the line-time distortion. Remember to ignore the first and

last ms of the bar. The time cursors can be used to locate the

appropriate time interval in the center of the bar. Set the time

separation to 16 ms, and put the time cursors in the TRACK mode.

Move the two cursors together until they are centered on the bar.

Line-time distortion-PAL. Line-time distortion in PAL systems is

measured with a signal that contains a 10 ms or 25 ms white bar. The

measurement methods given here quote the maximum departure of

the bar top from the level at the center of the line bar as the amount

of distortion, but they can be adapted for peak-to-peak measure-

ments. To make a measurement, measure the maximum deviation

from the center of the bar, and express that number as a percentage

of the level at bar center. The variable gain can be used to normalize

the center of the bar to 500 or 1000 mV. Deviations in the top of the

bar can then be read directly off the graticule in percent. Ignore the

first and last ms of the bar.

Line-time distortion measurements can also be made using the

voltage cursors in the RELATIVE mode. Define the amplitude

difference between blanking level and the bar center as 100%. Leave

one cursor at the bar center, and move the other cursor to measure

the peak positive and peak negative deviations in the top of the bar.

The largest of these numbers (ignore the sign) is the amount of

line-time distortion. The time cursors can be used to locate the

appropriate time interval in the center of the bar. Set the time

separation to the bar time (usually 10 ms or 25 ms) minus 2 ms. Put

the time cursors in the TRACK mode, and move the two cursors

together until they are centered on the bar.

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Operating Instructions

Remote Operation

REMOTE Connector

The rear-panel REMOTE connector is a subminiature 15-pin D-type

receptacle with female contacts. All the active Remote control lines

are enabled by remote ground closures or TTL levels (0 V to

+0.8 V). Pin assignments for the REMOTE connector are shown in

Figure 3–8 and Table 3–2. The REMOTE connector appears in the

1780R-Series Service Manual, Section 11, UART and A/D

Schematic Diagram.

Figure 3–8: REMOTE Connector Pin Assignments

Remote Operation

1. Connect the mating male plug supplied with the instrument to a

remote-box cable.

2. Remote lines named Presets 1 through 8 correspond to the

front-panel Preset menu Presets 1 through 8. These remote lines

allow configurations already stored at Presets 1 through 8 to be

recalled, and new configurations to be stored at those preset

locations.

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Operating Instructions

a. To recall a preset, force the corresponding remote line

low.

b. To store a front-panel configuration at a preset location,

apply a low first to the Store line (pin 11) and then to the

desired preset. Alternately, the Store line and desired

preset line may be forced low simultaneously.

Table 3–2: Remote Pin Functions

Name

Function

RGB Staircase Input

1 MW input impedance to ground. Requires 10 V

staircase signal.

/ RGB Enable

Low = RGB Enable. Routes the signal on pin 1 to the

Horizontal amplifier, where it is added to the ramps

from the Ramp Generator.

In RGB mode, the Ramp Generator reduces the

ramp to 1/3 or 1/4 size (selected by A2J585).

/ Remote Sync Enable

Low = Remote Sync Enable. INT / EXT Reference

turned off, and instrument sync provided by the

signal on pin 10.

/ Preset 2

/ Preset 3

/ Preset 1

/ Preset 4

Low with Pin 11 High = Recall Preset 2.

Low with Pin 11 Low = Store current F/P settings at

Preset 2 location.

Low with Pin 11 High = Recall Preset 3.

Low with Pin 11 Low = Store current F/P settings at

Preset 3 location.

Low with Pin 11 High = Recall Preset 1.

Low with Pin 11 Low = Store current F/P settings at

Preset 1 location.

Low with Pin 11 High = Recall Preset 4.

Low with Pin 11 Low = Store current F/P settings at

Preset 4 location.

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Operating Instructions

Table 3–2: Remote Pin Functions (Cont.)

Name

Function

Ground

Remote Sync Input

5 kW input impedance to ground. Polarity set by

jumper A2J192. Factory set for positive polarity.

/ Store

Low = Store.

Used with pin 5, 6, 7, 8, 12, 13, 14, or 15.

Low with Pin 11 High = Recall Preset 8.

/ Preset 8

Low with Pin 11 Low = Store current F/P settings at

Preset 8 location.

/ Preset 5

/ Preset 6

/ Preset 7

Low with Pin 11 High = Recall Preset 5.

Low with Pin 11 Low = Store current F/P settings at

Preset 5 location.

Low with Pin 11 High = Recall Preset 6.

Low with Pin 11 Low = Store current F/P settings at

Preset 6 location.

Low with Pin 11 High = Recall Preset 7.

Low with Pin 11 Low = Store current F/P settings at

Preset 7 location.

3. All front-panel controls operate in their usual manner during

remote operation, so remote selections may be changed with the

front-panel controls.

a. For a remote selection to be effective once it has been

deselected with the front-panel control, it is either selected

again with the front-panel control, or the ground closure is

removed and reattached.

b. Front-panel LED indicators light to show the current

selection.

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Operating Instructions

Serial Communications Interface

Serial Interface Connector

The rear-panel SERIAL interface connector is a 9-pin, sub-minia-

ture, D-type connector. It is used as an RS422A or RS232D interface

to the 1780R-Series microcontroller. Drivers for both interfaces are

resident. RS422A is a balanced voltage digital interface, and

RS232D is a serial binary data interchange. Figure 3–9 shows the

rear-panel SERIAL connector pin assignments.

Figure 3–9: Serial Interface Connector Pin Assignments

Building a Wiring Converter

Wiring converters can be built to connect the 1780R-Series 9-pin

SERIAL port with another 9-pin connector or with a 25-pin

connector. The 25-pin converter uses a 9-pin male connector

(Tektronix P/N 131-1007-00) and a 25-pin female connector

(Tektronix P/N 131-0971-00), as illustrated in Figure 3–10.

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Operating Instructions

9-Pin Male Connector

Figure 3–10: Serial Interface Connector Wiring Converter

Serial Remote Information

1780R-Series instrument configurations can be stored at (and

retrieved from) a remote location. To accomplish this, the 1780R-Se-

ries is connected to a host computer through a serial port that

supports RS-232 or RS-422 standards.

All front-panel controls operate in their usual manner during remote

operation, so remote selections may be changed with the front-panel

controls. Front-panel LED indicators light to show the current

selection.

Commands to the 1780R-Series and its responses are listed in Tables

3–3 and 3–4.

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Operating Instructions

Table 3–3: Serial Remote Commands to the 1780R-Series

Command*

Function

Results

#U or #u

UPLOAD

1780R-Series sends a stream of data, representing

the current instrument configuration, to the host

computer.

#D or #d

#P or #p

DOWNLOAD

1780R-Series expects a stream of data representing

an instrument configuration of the same form that was

uploaded.

PARTIAL

DOWNLOAD

1780R-Series expects a stream of data representing

an instrument configuration, with the knob settings

(focus, intensity, etc.) not affected.

The # character indicates a remote control command. The 1780R-Series

ignores all transmissions until this character is received.

Table 3–4: 1780R-Series Responses

Command

Description

The transmission was successful (ACK)

Command not known. (The # character was received, but was not followed

by a U, u, D, d, P, or p. )

Bad data received (all expected data consists of ASCII printable

characters.)

Bad internal checksum.

Bad transmission checksum (NACK)

Timed out (the process took too long to complete).

Software version number mismatch.

Serial data format: 8 data bits, 1 stop bit, no parity.

Baud rates supported are: 300, 1200, 9600, 19200. The baud rate

selection is made through page 3 of the Configure menu, with further

instructions later in this section.

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Operating Instructions

The data stream transmitted to and from the host (representing the

current 1780R-Series settings) consists of 512 bytes, followed by a

one-byte checksum. All data bytes are in the range of Hex 20 to Hex

7F, so that they are printable ASCII characters.

SCH Display

NOTE. Switch function is further described in Section 2.

Figure 3–11: Portion of the 1780R-Series Front Panel

With the 1780R-Series, there are two methods of viewing SCH Phase

errors; the method outlined here, utilizing the front-panel SCH

button, and F Time Marks through the Measurement Menu.

INT REF setting: two dots appear on the vectorscope compass rose.

The dots represent the 50% points of H Sync.

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Operating Instructions

EXT REF setting: only one dot appears on the vectorscope compass

rose. This relative mode allows the comparison of the color framing

of two signals. The two signals are color framed when the sync dot is

within 90_ of the burst vector.

SCH Phase Measurement Procedure

1. Select the SCH mode of operation by pushing the SCH / VECT

button, shown in Figure 3–11, until the SCH LED lights. Two

pushes may be required, depending on the previous condition.

2. Push the front-panel PHASE button.

3. Apply a signal to a 1780R-Series input channel and select that

channel for display.

4. Use the large knob to align the burst vector with the 180_

graticule line (normal position). Push the REF SET button to

obtain a 0.00_ readout (vectorscope CRT).

5. Use the large knob to move the dot (or closest of the two dots in

INT REF mode) to the 180_ graticule line. Readout now shows

SCH Phase error.

6. Push the SCH and PHASE buttons again to exit the mode.

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Operating Instructions

Parade Operation

NOTE. Switch function is further described in Section 2.

Select the Parade mode of operation by pushing the PARADE/

OVERLAY button, shown in Figure 3–11, until the Parade LED

lights. Two pushes may be required, depending on the previous

condition.

If One Line or Field is currently selected, instrument operation will

be forced to Two Line or Field.

Two Line or Field Parade

Parade mode simultaneously displays two signals side by side on the

CRT.

Pushing the CH A/PROBE switch will select from the following

input channel combinations for side-by-side display:

CH A and CH B1

CH A and PROBE

CH B1 and PROBE

Pushing the CH A–CH B1 / CH B1–CH B2 / CH B1–CH B3 switch

selects CH B1–CH B2 and CH B1–CH B3.

Pushing the CH B1 / CH B2 / CH B3 switch forces the instrument to

Three Line.

Three Line Display

The CH B1 / CH B2 / CH B3 switch provides a side-by-side display

of these three inputs.

Pushing a two-channel input switch forces the instrument to Two

Line.

Offset Menu

When only B input channels are displayed in Parade or Overlay, an

offset readout appears on the waveform CRT, as shown in Fig-

ure 3–12.

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Operating Instructions

Figure 3–12: Offsets Menu Screen

To obtain Offset menu, touch <OFFSET MENU> until <ON> is

outlined.

Touch <OFFSET> until <VAR> is outlined, and touch CHB2 or

CHB3 to assign large knob function to desired offset. Large knob

assignment will be circled.

Using the large knob, adjust offset of the selected display with

respect to the other display or displays.

DC Level Measurements

The 1780R-Series has the capability of indicating the DC levels of

the B1, B2, and B3 channels with a high degree of accuracy. This is

useful when adjusting the DC levels of RGB signals coming from a

CCU, for example. The following procedure details the DC

measurement technique for Parade mode.

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Operating Instructions

DC Level Measurement Procedure

1. Enter the Parade mode. Press the CONFIGURE button and then

use the vectorscope touch screen to select <GND> under the

<COUPLING> area. Press the CH B1 / CH B2 / CH B3 switch to

go to Three Line.

2. Ensure that the button under the WFM CRT is selected. Adjust

the VERT POS control to set the CH B1 (far left) trace to a

convenient reference line on the graticule. Setting the WAVE-

FORM GAIN to X5 provides increased resolution. Touch

<OFFSET> until <ON> is outlined.

3. Touch <OFFSET> until <VAR> is outlined, and touch <CH B2>

to assign large knob function to that channel.

4. Use the large knob to align CH B2 with CH B1.

5. Touch <CH B3> and use the large knob to align CH B3 with

CH B1.

6. Turn off the OFFSET MENU and change the <COUPLING>

from <GND> to <DC>. Press the CONFIGURE button to return

to the normal operating mode.

7. The DC levels of all three signals can now be read directly from

the graticule. (For NTSC graticules, one IRE = 7.142857 mV.)

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Operating Instructions

Overlay Operation

NOTE. Switch function is further described in Section 2.

Select the Overlay mode of operation by pushing the PARADE/

OVERLAY button, shown in Figure 3–11, until the Overlay LED

lights. Two pushes may be required, depending on the previous

condition.

The instrument is forced to One Line operation. Two and Three Line

modes are locked out; a beep sounds if the switch is pushed. The

LINE/FIELD switch is still operational.

Overlaid Displays

The CH A/PROBE switch will select from the following input

channel combinations for overlaid display:

CH A and CH B1

CH A and PROBE

CH B1 and PROBE

Subtract modes (A–B1 / B1–B2 / B1–B3 switch) are unavailable in

Overlay mode.

The CH B1 / CH B2 / CH B3 switch provides an overlaid display of

any two, or all three of these inputs.

Offset Menu

When only B input channels are displayed, an offset readout appears

in the upper right corner of the waveform CRT.

To obtain the Offset menu, touch <OFFSET MENU> until <ON> is

outlined.

Touch <OFFSET> until <VAR> is outlined, and touch <CH B2> or

<CH B3> to assign large knob function to desired offset. (If only two

input channels are selected, the menu will only provide one offset.)

Using the large knob, adjust offset of the selected display with

respect to the other two displays.

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Operating Instructions

WFM + CAL

NOTE. Switch function is further described in Section 2.

Enter WFM+CAL Mode

Select the WFM+CAL mode of operation by pushing the WFM /

WFM+CAL button, shown in Figure 3–11, until the WFM+CAL

LED lights. Two pushes may be required, depending on the previous

condition.

The WFM+CAL display appears on the right CRT. Sample readouts

are shown in Figures 3–13 and 3–14.

General WFM+CAL Information

The WFM+CAL mode provides an accurate measurement tool,

which can be used to measure such things as burst amplitude, sync

tip to white bar amplitude, and color bar amplitude.

The WFM+CAL signal consists of a video signal superimposed on a

calibrator signal. The video signal is displayed twice, with one

display offset from the other by the voltage level of the calibrator.

When operating in the <VAR> mode, the large knob will vary the

Calibrator amplitude, allowing accurate amplitude measurement

over a continuous range; when operating in <FIX>, it will not. Fixed

Calibrator amplitude is selected on page 1 of the Configure menu.

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Operating Instructions

Right CRT display

Figure 3–13: WFM + CAL Readout with ABS selected

Right CRT display

Figure 3–14: WFM + CAL Readout with REL selected

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Operating Instructions

When operating in the <VAR> mode, software versions 1.11 & Up

provide a choice of absolute or relative readouts. When <ABS> is

selected, the readout appears in IRE or mV. (For an IRE readout,

<IRE> must be selected on page 2 of the Configure menu.) When

<REL> is selected, the readout is given in both dB and percentage

(%) values, relative to a reference that is selected by pushing the

REF SET button. (Software versions below 1.11 provide a relative

readout only.)

Making Measurements Using VAR and ABS. This mode provides accurate

amplitude measurements in IRE or mV values. An example of the

readout is shown in Figure 3–13 (calibrator signal not shown).

1. Enter the WFM+CAL mode. Use the touch screen to select

<VAR> and <ABS>. Select Two Line sweep and Flat filter.

Apply a color bar signal to the 1780R-Series.

2. To measure the signal amplitude (sync tip to white bar), locate

the sync tip on the topmost of the two displays. Use the large

knob to vertically align the bottom of that sync tip with the white

bar of the bottom display. The CAL readout now displays sync

tip to white bar amplitude. X5 Gain can be used if desired.

3. To measure burst amplitude, locate the burst on the top display.

Use the large knob to vertically align the bottom of that burst

with the top of the lower display’s burst packet. The CAL readout

now displays burst amplitude.

4. Any feature of the waveform can be measured in the same

manner; use the large knob to align the bottom of the desired

feature with the top of the second appearance of that same

feature. This provides a readout of the voltage offset between the

two displays.

Making Measurements Using VAR and REL. This mode provides relative

measurements in dB and percent. An example of the readout is

shown in Figure 3–14 (calibrator signal not shown).

1. Enter the WFM+CAL mode. Use the touch screen to select

<VAR> and <REL>. Select Two Line sweep and Flat filter.

Apply a color bar signal to the 1780R-Series.

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Operating Instructions

2. Use the large knob to align a horizontal reference point (usually

the sync tip) of one display with the white bar of the second

display.

3. Push the REF SET button and obtain a CAL readout of 0.00 dB

and 100.0%.

4. Relative burst amplitude is measured in the same manner as

absolute (see step 3 of the preceding procedure). The CAL

readout will display the burst amplitude in dB and % of the total

signal amplitude.

5. The relative amplitude of any portion of the signal can be

measured in the same manner: use the large knob to align the

bottom of the desired feature with the top of the second

appearance of that same feature. The relative readouts are

provided in dB and percent (%) of total signal amplitude.

Using FIX. The 1780R-Series large knob has no effect in the <FIX>

mode.

This mode is used to compare the amplitude of the incoming video

signal to several internally calibrated amplitudes.

1. Enter the WFM+CAL mode. Use the touch screen to select

<FIX>. Select 2 Line and Flat filter. Apply a color bar signal to

the 1780R-Series.

2. For NTSC, if an IRE readout is desired, be sure that <IRE> is

selected on page 1 of the Configure menu.

3. Select the calibrator signal amplitude on page 1 of the Calibrate

menu.

4. Adjust the amplitude of the incoming video signal until the CAL

readout reflects the exact amplitude selected in step 3.

a. When using the calibrator setting of 1000 mV (140.0

IRE), the CAL readout should equal that value when the

sync tip of one display is aligned with the white bar of the

second display.

b. When using the calibrator setting of 714 mV (100.0 IRE)

for NTSC, or 700 mV for PAL, the CAL readout should

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Operating Instructions

equal that value when the back porch of one display is

aligned with the white bar of the second display.

c. The 700 mV (98.0 IRE) calibrator amplitude (NTSC and

PAL) can be used to adjust component levels for

component video.

d. The 300 mV (PAL) calibrator amplitude is used for

adjusting sync amplitudes.

Menu Information

Figure 3–15: Left Side of Front Panel, showing Menu Buttons and Touch

Screen

Menu Documentation Overview

This section describes the Password, Preset, Calibrate, Configure,

and Measure menus.

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Operating Instructions

Many selections are made by touching the desired word on the CRT

screen, as shown in Figure 3–15. This is indicated by the use of the

word ‘touch’ (as opposed to ‘push’ for front-panel switches).

The touch screen menu quadrants are illustrated as a documentation

tool, and do not actually appear on the CRT screen. If adjustment of

quadrants is necessary, refer to the 1780R-Series Service Manual.

Menu Access

The Preset, Measure, Configure, and Calibrate menus are enabled by

four front-panel menu buttons, shown in Figure 3–15.

Access to the Preset and Calibrate menus can be restricted by

password.

Password operation is enabled / disabled by a setting of S385 on the

MPU board. Instrument is shipped in the not enabled position. Refer

to the 1780R-Series Service Manual for the location of S385.

The Preset, Measure, and Configure menus are shown on the left

CRT, with the vectorscope display blanked.

The Calibrate menu is available for both vectorscope and waveform,

selected by pushing the button under the desired CRT.

The green LED in the button lights when a menu is enabled.

To exit a menu, push the same menu button again. Menus will also

be exited when another menu button is pushed, with the exception

that both the Preset and the Measure menu can be active at the same

time.

Touch Screen

Both CRTs are equipped with touch screens. Four vertical and four

horizontal divisions create 16 quadrants, shown in Figure 3–16.

Touching a quadrant enables the function or toggles between choices

displayed in that quadrant.

Current selections / functions are outlined by a box. Current large

knob assignment is circled.

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Operating Instructions

Figure 3–16: Touch Screen 4 X 4 Matrix

The touch screens are light sensitive, so it is not necessary to apply

pressure.

If it is necessary to adjust quadrant center points, refer to the

1780R-Series Service Manual.

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Operating Instructions

Password Menu

Figure 3–17: Password Menu Screen

Enable / Disable the Password

To enable password operation, place button #2 of S385 (MPU board)

in the closed position. Turn the instrument power to standby and

back to on for the microprocessor to recognize the new switch

setting. Disable in the same manner, placing button #2 in the open

position.

Define the Password

The first time a restricted access menu is selected after the jumper

has been moved, the words <DEFINE PASSWORD> are displayed

on screen.

Select the three-digit password, by touching the desired sequence of

numbers on the CRT screen (choose from the displayed numbers 1,

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Operating Instructions

2, 3, and 4). That password is then stored, and remains in memory,

even when the instrument power is turned to standby and back to on.

Change the Password

Move button #2 of S385 (MPU board) to the open position to disable

password operation.

Apply power to the instrument.

Follow preceding instructions to Enable the Password and Define the

Password.

Use the Password

Once password is enabled, it restricts access to the Preset and

Calibrate menus, and the Password menu, shown in Figure 3–17, is

displayed.

To access Name, Store, or Calibrate menu functions, touch the

numbers on the screen in proper sequence to form the password.

Once Name, Store, or Calibrate are selected, entering the correct

password will provide access to the desired menu.

Incorrect Password

Entering an incorrect password produces a momentary display

informing the user of denied access and exits the Name, Store, or

Calibrate menu screen. These menu screens can also be exited by

pushing the PRESET or CALIBRATE button again, or by disabling

the Password according to the preceding instructions.

NOTE. If the operator has reduced the Readout Intensity via the

Calibrate menu, then attempts to exit and re-enter that menu, the

Password menu may not be visible, and instrument functions may

appear to be locked up. Temporarily returning the instrument to

non-password operation will allow re-entry of the Calibrate menu.

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Operating Instructions

Preset Menu

Figure 3–18: Preset Menu Screen

Recall

Recall Preset Settings. Push PRESET button to enter Preset menu,

shown in Figure 3–18.

Recall desired preset by touching the preset name.

Example: <PRESET 9>.

Instrument is reset to configuration stored under that preset, menu

screen disappears, and selected preset name is displayed in the upper

right of the vectorscope CRT.

While the Preset LED is still on, pushing it will cancel the recall.

The LED is turned off by any front-panel activity.

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Operating Instructions

If a Measure menu selection (for example, user-modified R–Y

SWEEP setup) has been stored at a Preset location, recalling it will

cause the instrument to reenter the stored measurement mode (R–Y

SWEEP in this example), turning on both Preset and Measure LEDs.

Exit Preset Menu. Use one of these two methods to exit the Preset

menu:

1. Exit by pushing the front-panel PRESET menu button, and the

instrument returns to its previous settings.

2. Exit by changing any right-side front-panel control, and the

instrument continues to operate at the selected preset settings

(allowing modifications by the operator). When the preset has

been exited in this manner, the word <RECOVER> will be

displayed at the bottom of the menu screen the next time the

Preset menu is selected, as shown in Figure 3–18. Touch

<RECOVER> to return to previous instrument settings.

Presets 1 through 8 can also be accessed by ground closures through

the rear-panel REMOTE connector.

Recall Initial Settings. Push PRESET button to enter Preset menu.

Touch <INIT>. Instrument will be reset to the settings shown in

Table 3–5.

Table 3–5: Initial Settings

Control

Setting

Vector

Wfm

Control

Setting

Int

LEFT DISPLAY

RIGHT DISPLAY

REFERENCE

CW SYNC

FILTER

Ext

FOCUS, SCALE, INTENS Mid range

FLAT

VECT / WFM H & V POS

Approximate Center

WFM SWEEPS 2H,

MAG Off

screen

CH A

Calibrated

INPUT

BARS

75%

GAINS

DC REST

SYNC

Slow

DIR

FIX

READOUTS

GRATICULE

Int

CAL AMPL

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Operating Instructions

Table 3–5: Initial Settings (Cont.)

Control

Setting

Control

Setting

COUPLING

BEEP

FIELD TRIG

SLOW SWEEP TRIG

FRONT INPUT

VECTOR

BAUD RATE

PROBE GAIN

CLAMP

9600

HI Z

PAL (1781R only)

ABS UNITS

IRE (1780R)

mV (1781R)

The Preset menu LED will stay on until the menu is exited. <INIT>

is displayed in the upper right portion of the CRT.

Exit Initial Settings. Use one of these two methods to exit the Preset

menu:

1. Exit by pushing the front-panel PRESET menu button, and the

instrument returns to its previous settings.

2. Exit by changing any right-side front-panel control, and the

instrument continues to operate at the Initial settings (allowing

modifications by the operator).

Recover

<RECOVER> only appears on the CRT after:

1. Preset menu is entered.

2. Initial or Preset setting is recalled.

3. Preset menu is exited by modifying the recalled Initial or Preset

setting.

4. Preset menu is re-entered by pushing front-panel PRESET menu

button.

Push PRESET button to enter Preset menu.

Touch <INIT> or any of the 12 presets.

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Operating Instructions

As soon as any right-side front-panel control setting is changed, the

instrument settings (as configured before that change) are saved, and

the Preset menu is exited.

To recover saved configuration, push the PRESET button again, and

then touch <RECOVER>.

If the Preset menu is exited by pushing the PRESET button,

instrument configuration will not be saved.

Store

Presets can be used to store instrument front-panel configurations

and user-modified measurement setups.

Store a new setup:

H Configure items to be stored.

H Push PRESET button to enter Preset menu.

H Touch <STORE>. If password is enabled, enter the password

now.

H <WHICH PRESET?> is added to the display. <STORE>,

<RECOVER>, <NAME>, and <INIT> are omitted.

H Touch desired preset name.

Example: <PRESET 9> (will now be outlined on touch screen).

CAUTION. When <PRESS HERE TO STORE> is touched, the

previous configuration stored under that preset (Preset 9 in this

example) will be written over. If this is not desired, push the PRESET

menu button now to exit the menu without making changes.

H To store the new setup and return to the Preset menu, touch

<PRESS HERE TO STORE>.

H To exit the Preset menu without storing the new setup, push the

PRESET menu button.

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Operating Instructions

Name

Renaming a PRESET:

H Push the PRESET button to enter Preset menu.

H Touch <Name>. If password is enabled, enter the password now.

H <RENAME WHICH?> is added to the display. <STORE>,

<RECOVER>, <NAME>, and <INIT> are omitted.

H Touch the preset to be renamed.

Example:

<PRESET 1>.

H The Name menu screen, shown in Figure 3–19, is displayed.

H Push the buttons marked < > (under large knob) to select the digit

to be changed. The selected character is now outlined on the

screen.

H Rotate the large knob until the desired character is displayed. The

selections include: A through Z, 0 through 9, several punctuation

marks, international characters, and a space.

H Use the < > buttons to move to the next character to be changed.

H Select up to 8 digits in this manner.

H To return to the Preset menu without renaming the preset, touch

<CANCEL>. To exit the menu without renaming the preset, push

the front-panel PRESET button. To store the new preset name

and return to the Preset menu, touch <ACCEPT>.

H Up to 12 presets may be named.

H When all desired presets have been renamed, push the front-panel

PRESET button to exit the menu.

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Operating Instructions

Figure 3–19: Name Menu Screen

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Operating Instructions

Calibrate Menu

General Calibration Menu Information

The Calibrate menu is available for both vector and waveform, and

uses both CRTs.

Pushing the front-panel CALIBRATE button provides access to the

menu. Several calibration features (such as Readout Intensity) can be

selected using the touch screen menu. The settings can then be

modified (refer to the following Waveform and Vector calibration

procedures, or for more detailed procedures, refer to the 1780R-Se-

ries Service Manual). New settings are stored when the Calibrate

menu is exited.

The Calibrate menu can be exited by pushing the CALIBRATE

button again, or by pushing another menu button.

To toggle the display between vectorscope and waveform calibra-

tion, push the buttons under the CRTs. When waveform is selected,

the waveform calibrator is displayed on the right CRT, with

waveform menu selections on the left CRT (vectorscope display

blanked). When vectorscope is selected, the arrangement is reversed.

Waveform Calibration Information

The internal calibrator signal is selected by touching the <CAL

SIGNAL> area of the screen until <ON> is outlined. It automatically

reverts to <OFF> when the Calibrate menu is exited and must be

reselected (if desired) when the menu is reentered. (CAL signal is

not available in <CAL AMPL ZERO SET>.)

HORIZ POSITION KNOB CAL (present in instruments with SN

below B020245), VOLT CURSORS ZERO SET, and CAL AMPL

ZERO SET provide menu displays on the waveform CRT. The

current selection is indicated by a box on the vectorscope CRT, and

the large knob function is circled on the waveform CRT.

HORIZ CAL, EXT HORIZ CAL, VERT CAL, READOUT

INTENSITY, and TRACE ROTATION are circled when selected, to

indicate large knob assignment.

An external 1.0 volt reference signal is required to calibrate the

EXTERNAL HORIZONTAL INPUT.

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Operating Instructions

Waveform Calibration Procedure

1. Apply a video signal to a 1780R-Series input channel and select

that channel for display.

2. Push the front-panel CONFIGURE button and touch <FIXED

CAL AMPL> until 1000 (1.0 volt) is outlined.

3. Push the front-panel CALIBRATE button. If Password operation

is enabled, enter the password now. The Waveform Calibration

menu will be displayed, as shown in Figure 3–20.

4. <READOUT INTENSITY> will be circled, and a test readout

will be displayed. Use the large knob to adjust the readout to the

desired intensity. (It is necessary to adjust readout intensity in this

manner; the front-panel INTENSITY control is used to adjust

signal intensity only.)

Perform Step 5 for SN below B020245 only:

5. Touch <HORIZ POS KNOB CAL> to calibrate the Horizontal

Position knob. A menu will be displayed on the waveform CRT.

Center the Horizontal Position control by turning the knob and

releasing, allowing the spring (not necessarily the signal display)

to return to midpoint of its range. Then touch the area labeled

<CENTER HORIZONTAL POSITION KNOB, THEN PRESS

HERE>. This tells the microprocessor that the knob is now at the

midpoint, or zero point, of its range. This zero point is referred to

as the Dead Zone, and its tolerance can be varied by touching

<INCREASE> or <DECREASE>. The value changes in single

step increments from the smallest possible setting of 1 unit up to

16 units, and current value is shown on the readout. A beep

sounds when the Dead Zone has been increased or decreased as

much as possible. As the Dead Zone is increased, the control

must be turned more before it will respond, but will also return to

center more readily after it is turned.

6. Touch <TRACE ROTATION> to obtain a test axis, then use the

large knob to align the display to the graticule.

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Operating Instructions

Figure 3–20: Waveform Calibration Menu Display

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Operating Instructions

7. Touch <CAL AMPL ZERO SET> to obtain a menu on the

waveform CRT for adjusting the calibrator zero level. Adjust the

large knob to overlay the two calibrator waveforms. Press the

front-panel REFERENCE SET button to record this zero setting.

8. Touch <VOLT CURSORS ZERO SET>to obtain a Voltage

Cursor menu on the waveform CRT. Use the large knob to move

cursors, touching the <CURSOR 1 / CURSOR 2> area to toggle

between Cursors One and Two. When cursors are aligned, press

REFERENCE SET to reset the displayed voltage difference to

zero.

9. Touch <CAL SIGNAL ON / OFF> until <ON> is outlined. (CAL

signal is not available in <CAL AMP ZERO SET>.)

a. Select <VERT CAL>. Use the large knob to adjust the

vertical gain for a 1 V calibrator signal display on the

waveform CRT.

b. Select TWO LINE sweep with VAR sweep off.

c. Push the front-panel TIME button to turn on the timing

cursors. Reduce the display intensity if necessary to view

the timing cursor dots.

d. Touch the <CURSOR 1 / CURSOR 2> area of the screen

until <CURSOR 1> is outlined. Use the large knob to

move Timing Cursor 1 approximately 1 major division in

from the left edge of the graticule.

e. Select <CURSOR 2> and use the large knob to move it

100 msec to the right of Timing Cursor 1, as indicated on

the CRT readout.

f. Touch <HORIZ CAL>. The large knob will now adjust

sweep length (time) with respect to the graticule. Adjust

for 10 divisions between cursor dots.

g. Push the front-panel TIME button to turn off the timing

cursors. Readjust the readout intensity if necessary.

h. Apply a 1.0 volt signal to the EXT HORIZ input. Ensure

that the signal is properly terminated in 75 W.

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Operating Instructions

i. Touch <EXT HORIZ CAL>. The large knob will now

adjust sweep length (time) with respect to the graticule.

Do not change the MAG setting (automatically set to

100 mV/div). Adjust the large knob for a horizontal

display of 10 divisions.

Vectorscope Calibration Information

READOUT INTENSITY, TRACE ROTATION, and GAIN CAL

(GAIN 1 CAL / GAIN 2 CAL for NTSC software versions 1.11 &

Up) will be circled when selected, to indicate large knob assignment.

The oscillator signal is selected by touching the <CAL OSC> area of

the screen until <ON> is outlined. It automatically reverts to <OFF>

when the Calibration menu is exited and must be reselected (if

desired) when the menu is reentered.

Vectorscope Calibration Procedure

(for Software Versions 1.11 & Up)

1. Push the front-panel CALIBRATE button to enter the Calibration

menu. If Password operation is enabled, enter the password now.

Waveform calibration will be displayed.

2. Push the button under the left CRT (LED will light) to select

Vectorscope calibration, shown in Figures 3–21, 3–22, and 3–23.

3. <READOUT INTENSITY> will be circled, and a test readout

will be displayed. Use the large knob to adjust Readout intensity.

(Only Readout intensity is adjusted through the menu; signal

intensity is adjusted with the front-panel INTENSITY control.)

4. Touch <TRACE ROTATION> to obtain a test axis, then use the

large knob to adjust trace rotation.

5. To adjust Vectorscope Gain, touch <CAL OSC> until <ON> is

outlined. While the cal oscillator is on, the V axis switcher is

enabled and 75% bars are selected (with 7.5% setup for NTSC).

a. For 1780R (NTSC), touch <GAIN 1 CAL> and use the

large knob to make the circle match the compass rose.

Touch <GAIN 2 CAL> and again use the large knob to

make the circle match the compass rose. Touch <GAIN 1

CAL>.

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Operating Instructions

Figure 3–21: Vectorscope Calibration Menu Display for 1780R (NTSC),

software versions 1.11 & Up, with CAL OSC Off

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Operating Instructions

Figure 3–22: Vectorscope Calibration Menu Display for 1780R (NTSC),

software versions 1.11 & Up, with CAL OSC On

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Operating Instructions

For 1781R (PAL), touch <GAIN CAL> and use the large

knob to make the circle match the compass rose.

b. Touch <CAL OSC> until <OFF> is outlined.

6. To check the Vectorscope Gain adjustment, push the front-panel

CALIBRATE button to enter the Calibration menu, then push the

button under the left CRT.

a. Apply a color bar signal (with 7.5% Setup for NTSC) to a

1780R-Series input channel and select that channel for

display. A 100% or 75% color bar signal can be used,

depending on the vectorscope readout (derived from the

Configure menu setting).

b. Push the front-panel PHASE button and adjust the large

knob to properly align the phase of the burst and vectors

on the graticule. Push the PHASE button again to exit this

mode.

c. For 1780R (NTSC): Touch <GAIN 1 CAL>. Check that

the color bar vectors are in the graticule boxes. Set the

generator to 0% Setup, touch <GAIN 2 CAL (NO

SETUP)> and check that the color bar vectors are in the

graticule boxes. Return the generator to 7.5% Setup if

desired.

For 1781R (PAL): Touch <GAIN CAL>. Check that the

color bar vectors are in the graticule boxes.

d. Exit Calibrate menu.

Vectorscope Calibration Procedure

(for Software Versions 1.10 & Below)

Perform Steps 1 through 6 for both 1780R and 1781R (NTSC and

PAL).

1. Push the front-panel CALIBRATE button to enter the Calibration

menu. If Password operation is enabled, enter the password now.

Waveform calibration will be displayed.

2. Push the button under the left CRT (LED will light) to select

Vectorscope calibration, shown in Figure 3–23.

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Operating Instructions

Figure 3–23: Vectorscope Calibration Menu Display for 1781R (PAL) all

software versions, and for 1780R (NTSC) software versions 1.10 &

Below

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Operating Instructions

3. <READOUT INTENSITY> will be circled, and a test readout

will be displayed. Use the large knob to adjust intensity. (The

front-panel INTENSITY control adjusts signal intensity only.

Readout intensity must be adjusted through the Calibration

menu.)

4. Touch <TRACE ROTATION> to obtain a test axis, then use the

large knob to adjust trace rotation.

5. Touch <CAL OSC> until <ON> is outlined. While the cal

oscillator is on, the V axis switcher is enabled and 75% bars are

selected (with setup for NTSC).

a. Touch <GAIN CAL>. The large knob will now adjust

vectorscope gain. Use the large knob to make the circle

match the compass rose.

b. Exit Calibrate menu.

Perform Step 6 for 1780R (NTSC ) only.

6. Apply a 75% color bar signal with no setup to a 1780R input

channel and select that channel for display.

a. Push the front-panel CONFIGURE button to enter the

Configure menu. Touch the <PAGE> area of the screen

until <2> is outlined.

b. Touch <SETUP> until <NO> is outlined.

c. Touch <BARS> until <75%> is outlined.

d. Push the front-panel PHASE button to assign the large

knob function to phase shift. Adjust the large knob to

properly align the burst and vectors on the graticule.

e. Push the front-panel CALIBRATE button to enter the

Calibration menu, then push the button under the left

CRT.

f. Touch <GAIN CAL>. The large knob will now adjust

vectorscope gain. Use the large knob to set the color bar

vectors to fall on the boxes.

g. Exit Calibrate menu.

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Operating Instructions

Configure Menu

Changing Configurations

Push the CONFIGURE button to enter the Configure menu.

All front-panel controls remain operational during Configure menu

operation.

The Configure menu is a three-page menu, shown in Figures 3–24,

3–25, and 3–26. Page one of the menu is displayed first; touch

<PAGE> to toggle through pages.

Instrument configuration choices are displayed on the touch-screen

menu, with selected settings outlined.

To change a setting, touch the desired feature on the screen.

Example:

Touch <BARS> area to toggle between 75%

and 100% color bars.

To store changes, exit the Configure menu by pushing the front-pan-

el CONFIGURE button or by pushing another menu button.

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Operating Instructions

Left CRT display

Figure 3–24: Configure Menu Screen, page 1

Table 3–6: Configure Menu Selections, page 1

SYNC

Direct or Auto Frequency Controlled wfm sync.

COUPLING

AC / DC coupling or ground reference, sets all four inputs. (The probe

input is always AC coupled.) When GND is selected, the words

“INPUTS GROUNDED” are displayed on the CRT.

FIELD TRIG

For two-field sweep only, selects whether field one or field two will be

displayed on the left of the CRT.

FIXED CAL

AMPL

Selects one of three fixed calibration amplitudes:

700 mV, 714 mV, or 1000 mV.

DC REST

CLAMP

Wfm DC restorer clamps: slow, fast, or off.

Waveform is clamped to sync tip or back porch time.

PAL

PAL: +V and –V lines overlaid; appears as though only +V were

displayed (similar to NTSC display).

+V: The –V lines are demodulated 180° away from the +V lines.

SYSTEM

B/G I

Instrument operates in PAL systems B / G or I. ICPM measurements are

most affected (0 carrier reference level varies between systems).

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Operating Instructions

Left CRT display

Figure 3–25: Configure Menu Screen, page 2

Table 3–7: Configure Menu Selections, page 2

BARS

Vectorscope can be calibrated to 75% or 100% color bars.

PHASE

DISPLAY

360 = Phase reads from 0_ to 360_.

180 = Phase reads from +180_ to –179.95_.

VECT GRAT

WFM GRAT

ABS UNITS

Select internal or external graticule illumination.

NTSC only. Choose millivolts or IRE units to express calibrator and

voltage cursor amplitudes.

PROBE

X10

Internal probe gain is X1 or X10.

With 10X probe, 1 V signal at probe tip = 1 V on screen. Works like

probe input on 1480.

With X1 probe, 1 V signal at probe tip = 1 V on screen.

With X10 probe, 5 V signal at probe tip = 0.5 V on screen. For use with

TTL, etc.

SETUP

NTSC only. Select <YES> when there is 7.5% setup on the incoming

signal.

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Operating Instructions

Left CRT display

Figure 3–26: Configure Menu Screen, page 3

Table 3–8: Configure Menu Selections, page 3

CW SYNC

When CW subcarrier is used for vectorscope reference, wfm sync

source can be INT or EXT.

SLOW SWP TRIG Select positive or negative transition of the input signal to trigger slow

sweep.

BAUD RATE

Select the baud rate for the serial interface.

VECT READOUT

<ON> enables on-screen readouts of data during vectorscope

operation. <OFF> disables the readout. Full-screen menus are not

affected.

WFM READOUT

BEEP

<ON> enables on-screen readouts of data during waveform monitor

operation. <OFF> disables the readout. Full-screen menus are not

affected.

Beep is either on or off. When on, audio indicates when touch screen

selections have been made.

KNOB ASSIGN

TIMEOUT

When <ON>, with vectorscope CRT selected, will revert to waveform

CRT selection after 30 seconds of no knob activity.

VERSION

The version of software currently installed.

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Operating Instructions

Measure Menu

Left CRT display

Figure 3–27: Measure Menu Screen

Using the Measure Menu

Push the front-panel MEASURE button to enter the Measurement

menu, illustrated in Figure 3–27.

To select a measurement type, touch the desired measurement on the

screen. (Selections are described in Table 3–9.)

Example:

touch <DP & DG> to access simultaneous

Differential Phase and Differential Gain

measurements.

The menu display is replaced by vector and waveform displays, with

the selected measurement indicated in the upper left corner of the

vectorscope CRT.

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Operating Instructions

Front-panel and menu settings are automatically adjusted to

accommodate the selected measurement.

To exit a measurement mode, push the front-panel MEASURE

button. In the case of DIFF PHASE and DIFF GAIN measurements,

touch <GO TO DIFF GAIN> and <GO TO DIFF PHASE> areas of

the screen to alternate between those two measurements.

Table 3–9: Measure Menu Description

DIFF PHASE

DIFF GAIN

DP & DG

Differential Phase

Differential Gain

Simultaneous Differential Phase / Differential Gain

Signal-to-Noise ratio

NOISE

ICPM

Incidental Carrier Phase Modulation

K FACTOR

CHROMA/LUMA

measurement

Chrominance-to-Luminance Gain & Delay

SHORT TIME DISTORTION Short Time Distortion

R–Y SWEEP

BOWTIE

Demodulator output

Instrument set to B1–B2 and B1–B3 in Parade mode

FSC TIME MARKS

NTSC only. Bright-up dots on waveform at subcarrier

frequency

Beep

Although most front-panel buttons remain operational in Measure-

ment modes, some are locked. If an attempt is made to change a

locked setting, a beep sounds.

Store and Recall Modified Setups

Enter the Measure menu, select a measurement, and modify the

front-panel setup as desired.

Push the PRESET button. Following Preset menu instructions, store

the modified measurement information at any preset location.

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Operating Instructions

After both Preset and Measure menus have been exited, push the

PRESET button and touch the appropriate preset. The stored

measurement mode, including the user modifications, will be

recalled. Both Preset and Measure LEDs will be on.

Making Measurements

Detailed instructions for each measurement are given in Section 4.

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Measurements

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Measurements

Measurement Information

Figure 4–1: Measure Menu Access

NOTE. The measurements described in this section are accessed

through the Measurement menu, shown in Figure 4–1.

Push the front-panel MEASURE button to enable the Measurement

menu.

To access a desired measurement mode, touch the corresponding

area on the Measurement menu screen.

To exit a measurement mode, push the front-panel MEASURE

button again. In the case of DIFF GAIN and DIFF PHASE

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Measurements

measurements, touch the <GO TO DIFF PHASE> and <GO TO

DIFF GAIN> areas of the screen to alternate between those two

measurement modes.

To perform additional measurements, push the MEASURE button

and touch the next desired measurement.

Differential Phase Measurement

Enter DIFF PHASE Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <DIFF PHASE> on the screen.

The DIFF PHASE menu is displayed on the left CRT, with

demodulator output displayed on the right CRT, as shown in

Figure 4–2.

The instrument is now configured as specified in Table 4–1.

Large knob function is phase shift, and PHASE SHIFT LED lights.

Exit DIFF PHASE Mode

To exit DIFF PHASE mode, push the MEASURE button again. All

instrument settings return to previous state.

To move from DIFF PHASE mode to DIFF GAIN, touch the <GO

TO DIFF GAIN> area of the screen.

Horizontal positions, Vertical positions, and gain settings defined

while in DIFF PHASE mode will be stored when exiting, and

reinstated when this mode is selected again.

DIFF PHASE Menu Selections

NOTE. While operating in Line Select mode, noise reduction operates

only with full field test signals.

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Right CRT display

Left CRT display

Figure 4–2: Differential Phase Measurement

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Table 4–1: DIFF PHASE Front-Panel Configuration

VECTORSCOPE

WAVEFORM

Vector display enabled, other choices locked out.

R–Y sweep displayed, all front-panel choices locked out.

(There is no LED to indicate R–Y sweep.)

INPUT

Status does not change. All differential modes locked out; if

a differential mode was enabled, input is forced to CH A.

REFERENCE

FILTER

Status does not change.

Locked out.

WFM SWEEPS

Set to One Line when DIFF PHASE is selected. If

<SINGLE> mode is selected, any of the other sweeps can

be selected, using front-panel controls. If <DOUBLE> is

selected, the instrument is set to One Line. The Field, Two

Line and Three Line Sweeps are locked out.

GAINS

Vectorscope and Waveform gains can be adjusted while in

DIFF PHASE mode; the new settings will be saved when

the Measurement menu is exited, and reinstated when DIFF

PHASE mode is again enabled.

WAVEFORM POSITION

The Horizontal and Vertical Position controls can be

adjusted while in DIFF PHASE mode; the new settings will

be saved when the Measurement menu is exited, and

reinstated when DIFF PHASE mode is again enabled. The

Vertical Position Control range is limited in order to keep the

signal on screen.

VOLT / TIME CURSOR

Not available in DIFF PHASE mode.

Noise Reduction. Touch <NOISE REDUCTION> to toggle between

<ON> and <OFF>. When noise reduction is off, the demodulator

output (500 kHz BW) is directly displayed. When noise reduction is

on, noise reduction of about 10–12 dB is accomplished without any

reduction in bandwidth.

Noise reduction can be used in both <SINGLE> and <DOUBLE>

modes.

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Measurements

NOTE. Freeze only available with Noise Reduction ON.

Freeze. To capture the display (right CRT only), touch <NOISE

REDUCTION> so that <ON> is outlined, then touch <FREEZE>.

<FREEZE> will be outlined.

The captured display remains on the screen even if the input signal is

removed. The display is lost when the DIFF PHASE menu is exited

by any method, including touching <GO TO DIFF GAIN>, pushing

any of the four front-panel menu buttons, pushing the front-panel

LINE SELECT button to enter Line Select mode, changing the

selected line if already in Line Select mode, or turning instrument

power off.

To exit Freeze mode, touch <FREEZE> again.

DIFF PHASE Measurement Information

The 1780R-Series provides two methods of making differential

phase measurements: single- and double-trace.

The single-trace method of differential phase measurement

resembles the single-trace differential phase mode on the 520A-Se-

ries. This method requires the operator to normalize the gains, but

those settings will be stored and recalled at next entry to DIFF

PHASE mode. The amount of distortion is read from the graticule

scale.

The double-trace method of differential phase measurement

resembles the double-trace differential phase in the R520A-Series.

This method requires the operator to null the space between the ends

and individual steps of the two traces. This provides greater accuracy

than the single-trace method, and gives an on-screen readout of the

distortion measurement.

Single-Trace DIFF PHASE Measurement Procedure

1. Apply a staircase signal or a ramp signal with subcarrier to the

1780R-Series.

2. Touch <SINGLE>.

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Measurements

3. Use the vectorscope variable gain control to set the amplitude of

the chroma to be measured to the edge of the compass rose.

4. Use the large knob to set the phase of the chroma to be measured

to the nine o’clock position. See Figure 4–3.

5. Use the Waveform Vertical Position control to place the

beginning of the trace on a reference graticule mark.

6. Differential phase is that amount of signal that lies above or

below the reference graticule mark. Read the amount directly off

the graticule scale (waveform CRT); 1 major division = 1_

(10 IRE NTSC or 100 mV PAL).

Double-Trace DIFF PHASE Measurement Procedure

1. Apply a staircase signal or a ramp signal with subcarrier to the

1780R-Series.

2. Touch <DOUBLE>.

3. Use the vectorscope variable gain control to set the amplitude of

the chroma to be measured as desired, usually to the compass

rose. In Double DIFF PHASE mode only, this setting may be

altered to improve vertical resolution without affecting the

accuracy of the readout.

4. Use the large knob to bring the left ends of the two traces

(waveform CRT) together.

5. Push the REFERENCE SET front-panel button. Phase readout

should be 0.00_.

6. Locate the point of largest deviation between the two traces, and

use the large knob to bring the two traces together at that point.

7. Phase readout now gives the total amount of differential phase.

To measure the differential phase of each step in the signal,

repeat the process, bringing each individual step together.

Using Line Select in DIFF PHASE

1. Push the front-panel LINE SELECT button to enable Line Select

mode. Both the waveform monitor and vectorscope will be in

Line Select, and display the same line.

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Measurements

2. Line Select readout is provided on the waveform CRT. Make sure

the Line number is circled. If it is not, touch the screen in that

area.

3. Touch <MENU> to outline <ON> for Line Select menu display

on the vectorscope CRT. Make Line select menu choices as

desired.

4. Use large knob or < > buttons to change selected line.

Differential Gain Measurement

Enter DIFF GAIN Mode

Push the MEASURE button to enable the Measurement menu, as

shown in Figure 4–1.

Touch <DIFF GAIN> on the screen.

The DIFF GAIN menu is displayed on the left CRT, and the

demodulator sweep is displayed on the right CRT, as shown in

Figure 4–3. The instrument is now configured as specified in

Table 4–2.

Exit DIFF GAIN Mode

To exit DIFF GAIN mode, push the MEASURE button again. All

instrument settings return to previous state.

To move from DIFF GAIN mode to DIFF PHASE, touch the <GO

TO DIFF PHASE> area of the screen.

Horizontal positions, vertical positions, and gain settings defined

while in DIFF GAIN mode will be stored when exiting, and

reinstated when this mode is selected again.

DIFF GAIN Menu Selections

Noise Reduction. Touch <NOISE REDUCTION> to toggle between

<ON> and <OFF>. When noise reduction is off, the demodulator

output (500 kHz BW) is directly displayed. When noise reduction is

on, noise reduction of about 10–12 dB is accomplished without any

reduction in bandwidth.

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Measurements

Right CRT display

Left CRT display

Figure 4–3: Differential Gain Measurement

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Measurements

Table 4–2: DIFF GAIN Front-Panel Configuration

VECTORSCOPE

WAVEFORM

Vector display enabled, other choices locked out.

Demodulated sweep displayed, all front-panel choices

locked out. (There is no LED to indicate demodulated

sweep.)

INPUT

Status does not change. All differential modes locked out; if

a differential mode was enabled, input is forced to CH A.

REFERENCE

FILTER

Status does not change.

Locked out.

WFM SWEEPS

Set to One Line when DIFF GAIN is selected. If <SINGLE>

mode is selected, any of the other sweeps can be selected,

using front-panel controls. If <DOUBLE> is selected, the

instrument is set to One Line. The Field, Two Line, and

Three Line Sweeps are locked out.

GAINS

Vectorscope and Waveform gains can be adjusted while in

DIFF GAIN mode; the new settings will be saved when the

Measurement menu is exited, and reinstated when DIFF

GAIN mode is again enabled.

WAVEFORM POSITION

The Horizontal and Vertical Position controls can be

adjusted while in DIFF GAIN mode; the new settings will be

saved when the Measurement menu is exited, and

reinstated when DIFF GAIN mode is again enabled. The

Vertical Position Control range is limited in order to keep the

signal on screen.

VOLTAGE & TIMING

CURSORS

Not available in DIFF GAIN mode.

Noise reduction can be used in both <SINGLE> and <DOUBLE>

modes.

NOTE. Freeze available only with Noise Reduction ON.

Freeze. To capture the display (right CRT only), touch <NOISE

REDUCTION ON>, then touch <FREEZE>.

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Measurements

The captured display remains on the screen even if the input signal is

removed. The display is lost when the DIFF GAIN menu is exited by

any method, including touching <GO TO DIFF PHASE>, pushing

any of the four front-panel menu buttons, pushing the front-panel

LINE SELECT button to enter Line Select mode, changing the

selected line if already in Line Select mode, or turning instrument

power off.

To exit Freeze mode, touch <FREEZE> again.

DIFF GAIN Measurement Information

The 1780R-Series provides two methods of making differential gain

measurements: single- and double-trace.

The single-trace method of differential gain measurement resembles

differential gain on the 520A-Series. This method requires the

operator to normalize the gains, but those settings will be stored and

recalled at next entry to DIFF GAIN mode. The amount of distortion

is read from the graticule scale.

The double-trace method of differential gain measurement resembles

double-trace differential phase in both 1780R-Series and R520A-Se-

ries. This method requires the operator to null the space between the

ends and individual steps of the two traces. This provides greater

accuracy than the single-trace method, and gives an on-screen

readout of the distortion measurement.

Single-Trace DIFF GAIN Measurement Procedure

1. Touch <SINGLE>.

2. Apply a staircase signal or a ramp signal with subcarrier to the

1780R-Series.

3. Use the vectorscope variable gain control to set the amplitude of

the chroma to be measured to the edge of the compass rose.

4. Use the large knob to set the phase of the chroma to be measured

to the nine o’clock position. See Figure 4–3.

5. Use the Waveform Vertical Position control to place the

beginning of the trace (waveform CRT) on a graticule reference

mark.

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Measurements

6. Differential gain is the amount of signal that is above or below

the graticule reference mark. Read the amount directly off the

graticule scale (waveform CRT); 1 major division = 1% (10 IRE

NTSC or 100 mV PAL).

Double-Trace DIFF GAIN Measurement Procedure

1. Apply a staircase signal or a ramp signal with subcarrier to the

1780R-Series.

2. Touch <DOUBLE>.

3. Use the vectorscope variable gain control to set the amplitude of

the chroma to be measured to the compass rose.

4. Locate the point of largest deviation between the two traces

(waveform CRT), and use the large knob to bring the traces

together at this point.

5. Push the REFERENCE SET front-panel button. Diff gain readout

should be 0.0%.

6. Locate the point of largest deviation between the two traces, and

use the large knob to bring the traces together at this point.

7. Diff gain readout (waveform CRT) now gives the total amount of

differential gain.

8. To measure the differential phase of each step in the signal,

repeat the process, bringing each individual step together.

Using Line Select in DIFF GAIN

1. Push the front-panel LINE SELECT button to enable Line Select

mode. Both the waveform monitor and vectorscope will be in

Line Select, and display the same line.

2. Line Select readout is provided on the waveform CRT.

3. Touch <MENU> to outline <ON> for Line Select menu display

on the vectorscope CRT.

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Measurements

Simultaneous Diff Phase & Diff Gain Measurements

Enter DP & DG Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <DP & DG> on the screen to enable simultaneous differential

phase and differential gain measurements.

The DP & DG menu is displayed on the left CRT, and the demodu-

lated sweep is displayed on the right CRT. See Figure 4–4.

The instrument is now configured as specified in Table 4–3.

Exit DP & DG Mode

To exit DP & DG mode, push the MEASURE button again. All

instrument settings return to previous state.

Horizontal positions, vertical positions, and gain settings defined

while in DP & DG mode will be stored when exiting, and reinstated

when this mode is selected again.

DP & DG Menu Selections

Noise Reduction. Touch <NOISE REDUCTION> to toggle between

<ON> and <OFF>. When noise reduction is off, the demodulator

output (500 kHz BW) is directly displayed. When noise reduction is

on, noise reduction of about 10–12 dB is accomplished without any

reduction in bandwidth.

Freeze. To capture the display (right CRT only), touch <NOISE

REDUCTION> so that <ON> is outlined, then touch <FREEZE>.

<FREEZE> will be outlined.

The captured display remains on the screen even if the input signal is

removed. The display is lost when the DP & DG menu is exited by

any method, including pushing any of the four front-panel menu

buttons, pushing the front-panel LINE SELECT button to enter Line

Select mode, changing the selected line if already in Line Select

mode, or turning instrument power off.

To exit Freeze mode, touch <FREEZE> again.

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Measurements

Right CRT display

Left CRT display

Figure 4–4: DP & DG Measurement

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Measurements

Table 4–3: DP & DG Front-Panel Configuration

VECTORSCOPE

WAVEFORM

Vector display enabled, other choices locked out.

Demodulated sweep displayed, all front-panel choices

locked out. (There is no LED to indicate demodulated

sweep.)

INPUT

Status does not change. All differential modes locked out; if

a differential mode was enabled, input is forced to CH A.

REFERENCE

FILTER

Status does not change.

Locked out.

WFM SWEEPS

Set to Two Line when DP & DG is selected. Field, One Line,

and Two Line Sweeps are locked out.

GAINS

Vectorscope and Waveform gains can be adjusted while in

DP & DG mode; the new settings will be stored and recalled

at next entry to DP & DG mode.

WAVEFORM POSITION

The Horizontal and Vertical Position controls can be

adjusted while in DP & DG mode; the new settings will be

stored and recalled at next entry to DP & DG mode. The

Vertical Position control range is limited to keep the signal

on screen. The Vertical Position control range is limited in

order to keep the signal on screen.

VOLT / TIME CURSOR

Not available in DP & DG mode.

DP & DG Measurement Information

Single-Trace DP & DG. While the 1780R-Series provides two methods

of making differential phase and differential gain measurements,

only the single-trace method is available for simultaneous differen-

tial phase and gain measurements. A two-line display is used to

display the two measurements simultaneously on one CRT

(waveform monitor), with single-trace diff phase on the left portion

of the CRT and single-trace diff gain on the right portion of the CRT.

The single-trace method of differential phase and gain measurement

resembles differential phase on the TEKTRONIX R520A-Series.

This method requires the operator to normalize the gains, but those

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Measurements

settings will be stored and recalled at next entry to DP & DG mode.

The amount of distortion is read from the graticule scale.

DIFF PHASE & DIFF GAIN Measurement Procedure

1. Apply a staircase signal or a ramp signal with subcarrier to the

1780R-Series.

2. Touch <DP & DG>.

3. Use the vectorscope variable gain control to set the amplitude of

the chroma to be measured to the edge of the compass rose.

4. Use the large knob to set the phase of the chroma to be measured

to the nine o’clock position on the vectorscope display.

5. Use the Waveform Vertical Position control to place the

beginning of the trace on a convenient graticule reference line.

6. Using the two-line display, differential phase and gain are

displayed simultaneously on the left and right portions of the

waveform monitor CRT. If necessary, adjust the vectorscope

Variable Gain to vertically align the two displays.

7. Differential phase is the amount of the left signal that is above or

below the graticule reference line. Read the amount directly off

the graticule scale; 1 major division (10 IRE or 100 mV) = 1_.

8. Differential gain is the amount of the right signal that is above or

below the graticule reference line. Read the amount directly off

the graticule scale; 1 major division (10 IRE or 100 mV) = 1%.

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Measurements

Noise Measurement

Enter Noise Measurement Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <NOISE> on the screen.

Exit Noise Measurement Mode

To exit Noise mode, push the MEASURE button again. All

instrument settings return to their previous state.

Noise Measurement Procedure

Input the signal to be measured to the 1780R-Series and display on

screen.

Noise can best be evaluated on a constant-luminance portion of the

signal, such as back and front porch, sync tip, or color bars’ white

bar.

Adjust the large knob so that the gap between the waveforms just

disappears. VAR GAIN is automatically set to maximum for lowest

internal noise; Waveform X5 Gain can be selected for better

accuracy with low noise.

Read the signal / noise ratio directly from the on-screen readout.

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Measurements

ICPM Measurement

Enter ICPM Measurement Mode

(Incidental Carrier Phase Modulation)

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <ICPM> on the screen.

The instrument is now configured as specified in Table 4–4.

Table 4–4: ICPM Front-Panel Configuration

VECTORSCOPE

WAVEFORM

INPUT

Selected by operator

Waveform display enabled, other choices locked out

Selected by operator

Locked

REFERENCE

FILTER

Low pass

WFM SWEEPS

MAGNIFIER

Locked

Automatically set to X25, other choices may be selected by

operator.

GAINS

Calibrated gains

WAVEFORM POSITION

Horizontal and Vertical Position control settings selected by

operator are saved and reinstated each time the ICPM

mode is enabled.

Exit ICPM Measurement Mode

To exit ICPM mode, push the MEASURE button again. All

instrument settings return to their previous state.

ICPM Measurement Information

ICPM is measured by observing an XY display of quadrature output

of a 1450 demodulator versus the video signal itself.

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Measurements

The 1780R-Series ICPM measurement method is similar to the

Tektronix 1480-Series method. Refer to the 1450 manual for details

on configuring the demodulator for this measurement. The external

low-pass filters (Tektronix P/N 015-0352-00) can be used to improve

the display.

ICPM Measurement Procedure

1. Connect the Quadrature Out of the 1450 or TV1350 Demodulator

to the 1780R-Series EXT HORIZ Input and the Video Out to the

selected 1780R-Series input channel.

2. Push the MEASURE button to enable the Measurement menu.

For in-service ICPM measurements, LINE SELECT can be used

to select the desired line (zero reference pulse, then modulated

staircase signal.) For software versions 1.13 and up: LINE

SELECT can be used to select two lines for an overlaid display.

Push the front-panel LINE SELECT button, then touch the circle

in the lower left portion of the vectorscope CRT to assign large

knob function. Select the line and field where the zero reference

pulse is located. To select the second line, touch the circle in the

lower left portion of the waveform touch screen, and select the

line and field where the modulated staircase signal is located.

Touch the ICPM error readout area of the waveform CRT to

return the large knob assignment to the graticule, then proceed to

step 3.

3. Turn intensity to maximum, to locate the position of the trace off

screen. Use the 1780R-Series Horizontal Position control to

center the signal horizontally, and the Vertical Position control to

set the zero carrier reference point to the center of the electronic

graticule plus mark (+). See Figure 4–5. Turn down intensity for

normal viewing.

4. If no ICPM is present on the carrier, the display between

blanking and zero carrier will line up on the vertical axis. If

ICPM is present, the display will tilt. Use the precision control

(large knob) to adjust the electronic graticule until it just touches

the portion of the signal with the greatest error. Adjust the

Magnification factor as needed to best view the error.

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Measurements

5. The 1780R-Series on-screen readout shows the ICPM phase error

in degrees.

Figure 4–5: Making ICPM Measurements

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Measurements

K Factor Measurement

Enter K Factor Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <K FACTOR> on the screen.

K FACTOR is displayed on the left CRT. The input signal and

electronic graticule are displayed on the right CRT.

The instrument is now configured as specified in Table 4–5

Making K Factor Measurements

1. Use the Horizontal Position and the Waveform Var Gain as

needed to position the signal baseline on the dotted electronic

graticule line and position the top of the pulse at the center of the

electronic graticule plus sign (+). See Figure 4–6.

2. Use the large knob to adjust the electronic K Factor graticule

outline to just touch the point of greatest signal error.

a. Use X5 Gain as needed to view the signal. To ensure a

calibrated graticule, if the Var Gain was employed while

in X1 Gain, it must remain on while in X5 Gain.

3. Read the K Factor error in percent on the CRT readout.

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Right CRT display

Left CRT display

Figure 4–6: K Factor Electronic Graticule

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Measurements

Table 4–5: K Factor Front-Panel Configuration

VECTORSCOPE

WAVEFORM

INPUT

Selected by operator

Waveform display enabled, choices locked out

Selected by operator

REFERENCE

FILTER

Status does not change

WFM SWEEPS

One Line sweep selected, other choices may be selected by

operator.

GAINS

VAR Waveform gain selected

WAVEFORM POSITION

Horizontal and Vertical Position control settings selected by

operator are saved and reinstated each time the ICPM

mode is enabled.

VOLTAGE & TIMING

CURSORS

Both voltage and timing cursors are available in K Factor

measurement mode.

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Measurements

Chroma / Luma Inequalities Measurement

Enter Chroma / Luma Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <CHROMA / LUMA> on the screen.

Vectorscope and waveform displays are enabled and the instrument

is now configured as shown in Figure 4–7 and Table 4–6.

Exit Chroma / Luma Mode

To exit Chroma / Luma mode, push the MEASURE button again. All

instrument settings return to their previous state.

Horizontal positions, vertical positions, and gain settings defined

while in Chroma / Luma mode will be stored and reinstated when

this mode is selected again.

Cursors in Chroma / Luma

Ensure that <C/Y> is selected.

The cursors may be used to extract nomograph data from the

1780R-Series instrument. Five cursor settings must be entered by the

operator, using the waveform monitor CRT. Readout in the upper

right corner of CRT guides operator through the five settings, which

are described in the following procedure.

Making Chroma / Luma Measurements (Using Cursors)

1. Select Pulse Width

a. Touch <12.5T>, <25T>, or <OTHER> for NTSC. Touch

<10>, <20>, or <OTHER> for PAL. Chroma / Luma gain

error readings are not affected by pulse width.

2. Set Pulse Amplitude

a. Adjust Horizontal Position and Magnification to place the

modulated sine-squared pulse on screen.

b. Set Cursor 1 to the pulse top. Set Cursor 2 to the baseline.

c. Touch <ENTER>.

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Measurements

Right CRT display

Left CRT display

Figure 4–7: Initial Chroma / Luma Inequalities Measurement Screen

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Measurements

Table 4–6: Chroma / Luma Front-Panel Configuration

VECTORSCOPE

Vector display initially enabled, other choices locked out.

Chroma-to-Luma Lissajous display selected by touching

<VECTOR / C/Y> area of screen.

WAVEFORM

INPUT

Waveform display enabled, other choices locked out.

Status does not change. All differential modes locked out; if

a differential mode was enabled, input is forced to CH A.

REFERENCE

FILTER

Status does not change.

Flat filter automatically selected. Other choices locked out.

WFM SWEEPS

Sweep settings (typically X10 or X20 Mag) selected by

operator are saved and re instated each time the Chroma /

Luma mode is enabled.

GAINS

Vectorscope and Waveform gain settings selected by

operator are saved and reinstated each time the Chroma /

Luma mode is enabled.

WAVEFORM POSITION

Horizontal and Vertical Position control settings selected by

operator are saved and reinstated each time the Chroma /

Luma mode is enabled.

VOLTAGE & TIMING

CURSORS

Voltage cursors are automatically enabled. Cursors can be

used to extract stored nomograph data.

3. Set Left Lobe Amplitude

a. Position Cursor 1 on the point of the left lobe that is

furthest from the baseline. Leave Cursor 2 on the baseline.

b. Touch <ENTER>.

4. Set Right Lobe Amplitude

a. Position Cursor 1 on the point of the right lobe that is

furthest from the baseline. If no right lobe is present

(indicating no delay error), set Cursor 1 to the baseline.

Leave Cursor 2 on the baseline.

b. Touch <ENTER>.

5. Set Modulated Sine-squared Pulse H.A.D.

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Measurements

If OTHER was selected on Step 1, this step allows the 1780R-Se-

ries instrument to determine the pulse width and adjust the

readout accordingly.

a. Voltage cursors are automatically set to 50% of the

amplitude entered in step 2.

b. Timing cursors are enabled and appear as bright-up dots

on the display. Large knob now controls timing cursor

position.

c. Adjust Timing Cursor 1 to the point where the pulse signal

intersects the approximate 50% amplitude level identified

by the Voltage Cursor.

d. Adjust Timing Cursor 2 to the point where the opposite

side of the pulse signal intersects the Voltage Cursor. See

Figure 4–8.

Figure 4–8: Setting Timing Cursors to Pulse Width

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Measurements

Chroma / Luma Measurements with Lissajous Display

The Lissajous display is an X/Y plot of the sine-squared luminance

pulse versus the sine-squared envelope of the demodulated

chrominance. This display is useful when signals have previously

been transcoded into a component format, so that R–Y and B–Y may

be unequally delayed with respect to luminance.

While still in the Chroma / Luma measurement mode, touch

<VECT / C/Y> to outline <VECT>.

Set large knob function to phase control by touching the <PHASE>

area of the vectorscope CRT.

Using the large knob to set phase, set the burst vector to the

9 o’clock position for an R–Y versus luminance display, or to the

6 o’clock position for a B–Y versus luminance display.

If there are no chrominance-to-luminance errors, the Lissajous

display will show a straight line at 45_.

Phase delay causes separation of the display.

Gain inequalities cause displacement of the display end points.

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Measurements

Short-Time Distortion Measurement

Enter Short-Time Distortion Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <SHORT-TIME DISTORTION> on the screen.

Vectorscope and waveform displays are enabled and the instrument

is now configured as shown in Figure 4–9 and Table 4–7.

Exit Short-Time Distortion Measurement Mode

To exit the Short-Time Distortion mode, push the MEASURE button

again. All instrument settings return to their previous state.

Short-Time Distortion Measurement Procedure

Use the Vertical and Horizontal Position controls and the Waveform

VAR gain to position the signal as follows: The signal baseline goes

through the graticule “+” at the lower left of the CRT, the rising edge

goes through the “+” at center screen, and the top of the signal goes

through the “+” in the upper right of the screen. See Figure 4–9.

Use the large knob to adjust the electronic graticule to just touch the

signal at the point of greatest error.

Obtain the Short-Time Distortion error from the on-screen readout,

which is given in percent of the overall bar signal amplitude.

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Measurements

Right CRT display

Left CRT display

Figure 4–9: Short-Time Distortion Electronic Graticule

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Measurements

Table 4–7: Short-Time Distortion Mode Front-Panel Configuration

VECTORSCOPE

WAVEFORM

Selected by operator

Waveform display enabled, other choices may be selected

by operator

INPUT

Status does not change

REFERENCE

FILTER

Status does not change

Flat is selected, other choices are locked up

One Line selected

WFM SWEEPS

GAINS

Waveform VAR is selected

WAVEFORM POSITION

Horizontal and Vertical Position control settings selected by

operator are saved and reinstated each time the Short-Time

Distortion mode is enabled

VOLTAGE & TIMING

CURSORS

Both Voltage and Timing cursors are available

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Measurements

R–Y Sweep Measurement

Enter R–Y Sweep Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <R–Y SWEEP> on the screen.

Vectorscope and waveform displays are enabled and the instrument

is now configured as shown in Table 4–8.

Table 4–8: R–Y Sweep Mode Front-Panel Configuration

VECTORSCOPE

WAVEFORM

INPUT

Vector or SCH Selected by operator. Other choices locked.

Waveform display enabled, other choices locked.

Status does not change

REFERENCE

FILTER

Status does not change

Locked

WFM SWEEPS

Two Field is selected. Other choices may be made by

operator.

GAINS

Gain control settings selected by operator are saved and

reinstated each time the R–Y Sweep mode is enabled.

WAVEFORM POSITION

Horizontal and Vertical Position control settings selected by

operator are saved and reinstated each time the R–Y

Sweep mode is enabled.

VOLTAGE & TIMING

CURSORS

Both Voltage and Timing cursors are available

Exit R–Y Sweep Measurement Mode

To exit the R–Y Sweep mode, push the MEASURE button again. All

instrument settings return to their previous state.

R–Y Sweep Mode Information

The 1780R-Series R–Y Sweep mode provides a voltage-versus-time

display (on the waveform monitor CRT) of the vectorscope R–Y

demodulator output.

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Measurements

Using R–Y Sweep Mode

1. Set the burst to 180_ on the vector graticule. The R–Y compo-

nent of the input signal is viewed on the waveform CRT.

2. Set the front-panel VECT / SCH INPUT selection to SCH, and

the SCH Phase component is added to the R–Y display. The SCH

Phase display is proportional to the amplitude of the R–Y display,

and has a rise time of approximately 70 horizontal lines.

3. With a Field rate sweep selected, the location and relative

magnitude of the field rate SCH Phase errors are viewed. If no

SCH Phase errors are present, the display will be flat for NTSC.

For PAL, the display consists of a perfect 25 Hz sine wave, with

SCH Phase errors seen as deviations from the sine wave.

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Measurements

Bowtie Measurement

Use the following information to perform bowtie measurements.

Enter Bowtie Measurement Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <BOWTIE> on the screen.

BOWTIE is displayed on the left CRT. The CH B1–B2 and CH

B1–B3 signals are displayed on the right CRT. The instrument is

now configured as specified in Table 4–9 and Figure 4–10.

The large knob has no function in Bowtie mode.

Bowtie Measurement Procedure

1. To check for timing and relative amplitude errors in a three-wire

signal path, route a Bowtie test signal from a generator, through

the signal path, to the 1780R-Series CH B1, CH B2, and CH B3

Inputs.

2. Push the MEASURE button, then touch <BOWTIE> on screen.

3. Check for a sharp null in the center of each half of the two-line

signal display. The timing marker details in the waveform are an

electronic graticule for calibration of the timing offsets. The

center (taller) pulse is the 0 time error mark. Each mark away

from center indicates 20 ns of relative timing error. The left half

compares CH B1 with CH B2, and the right half compares

CH B1 with CH B3.

4. A broad null indicates unequal amplitudes between signals.

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Measurements

Right CRT display

Left CRT display

Figure 4–10: Bowtie Measurement Screen

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Measurements

Table 4–9: Bowtie Mode Front-Panel Configuration

VECTORSCOPE

WAVEFORM

INPUT

Selected by operator

Parade selected, other choices locked

B1–B2 & B1–B3 selected, other choices locked

Status does not change

REFERENCE

FILTER

Status does not change

WFM SWEEPS

GAINS

Two Line selected, other choices locked

Gain setting selected by operator are saved and reinstated

each time the Bowtie measurement mode is enabled

WAVEFORM POSITION

TIMING CURSORS

Horizontal and Vertical Position control settings selected by

operator are saved and reinstated each time the Bowtie

measurement mode is enabled

Timing cursors are available

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Measurements

F_SCTime Marks Measurement

Enter F Time Marks Measurement Mode

Push the MEASURE button to enable the Measurement menu,

shown in Figure 4–1.

Touch <FSC TIME MARKS> on the screen.

The large knob function is assigned to phase shift.

The instrument is now configured as specified in Table 4–10.

Table 4–10: F Time Marks Front-Panel Configuration

VECTORSCOPE

WAVEFORM

SCH display automatically enabled; other choices may be

selected by operator.

Waveform display enabled, other choices may be selected

by operator.

INPUT

Status does not change.

REFERENCE

FILTER

Status does not change.

WFM SWEEPS

Sweep and Mag settings selected by operator are saved

and reinstated each time the F time marks mode is

enabled.

GAINS

Gain settings selected by operator are saved and reinstated

each time the F time marks mode is enabled.

WAVEFORM POSITION

Horizontal and Vertical Position control settings selected by

operator are saved and reinstated each time the F time

marks mode is enabled.

TIMING CURSORS

Timing Cursors are not available.

Exit F Time Marks Measurement Mode

To exit F Time Marks mode, push the MEASURE button again.

All instrument settings return to their previous state.

Phase set while in Time Marks mode is stored and reinstated each

time this mode is selected.

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Measurements

Making SCH Phase Measurements

The 1780R-Series offers two methods of measuring SCH phase

errors: The polar SCH display, and this F Time Marks (voltage-vs-

time) method. The F time marks display is more direct than the

polar display, and affords the operator more manual control, but may

provide a less precise measurement. To ensure an accurate

measurement, both methods can be used.

1. Adjust the waveform monitor controls for a high resolution

display of sync.

2. Adjust the large knob until one of the bright-up dots is at the 50%

point of the leading edge of sync on the waveform display.

3. Push the front-panel REFERENCE SET button. The phase

readout is now 0.00_.

4. Adjust the large knob until the dots are on the zero crossing (or

50% point) of burst on the waveform display.

5. The vectorscope CRT readout now gives SCH phase error in

degrees.

Voltage Cursors in F Time Marks Mode

While in Time Marks mode, push the front-panel VOLTAGE

CURSOR button. A voltage cursor menu appears on the right side of

the vectorscope CRT. Touch <ABSOLUTE / RELATIVE> or

<SEPARATE / TRACK> to toggle between those voltage cursor

functions. Refer to the section on Voltage Cursors in Section 3 of this

manual for more details.

Verifying Burst Position

The F time marks display can be used to verify that burst is

located 19 subcarrier cycles from the 50% point of the leading edge

of sync.

Position one of the dots on the 50% point of sync, and count the

number of dots between that dot and the dot on the zero crossing of

the first full cycle of burst.

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Measurements

Other Measurements

The 1780R-Series instruments are capable of other measurements

not described in this manual, such as Group Delay and Chrominance

Non-Linear Phase and Gain. These measurements and others are

covered in the book, Television Measurements, available through

Tektronix Customer Support.

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Specifications

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Specifications

Table 5–1: Input/Output

Performance

Requirements

Supplemental

Information

Characteristics

Vertical Ranges

Volts Full Scale

1.0

Accuracy – 1.0 V ±0.007 V.

P-to-P Amplitude for Full

Graticule.

1.0 volt / 140 IRE.

Var

≤0.5:1 to ≥1.5:1 (0.67 V to

2.0 V input signal can be

made full scale).

Input Gain Ratios

A to B

1:1 ±0.002 (0.998 – 1.002)

AUX VIDEO IN to A

Input

1.5 dB ±0.3 dB

Input A to AUX VIDEO 1:1 ±0.005 (0.995 – 1.005)

OUT

Input A to PIX MON

OUT

1:1 ±0.02 (0.98 – 1.02)

Vertical Magnifier

X5 Accuracy

0.2 V ±0.007 V.

P-to-P Amplitude for

Full Graticule

0.2 volt / 28 IRE.

Maximum Input Signal

AC Couple All Inputs

2.0 V, p-to-p, 10% – 90% APL. Aux Video Out and Pix Mon

(terminated), 1.0 V p-to-p,

10% – 90% APL.

DC Couple All Inputs

±1.5 V (DC + peak AC).

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Specifications

Table 5–1: Input/Output (Cont.)

Performance

Requirements

Supplemental

Information

Characteristics

Max volts from Loop- 2 V rms at mains frequency.

Through common

terminal to chassis

Rejection ratio of common-

to-chassis in floating

ground mode, ≥34 dB at

mains frequency.

Max DC Output Voltage

Aux Video Out

±0.5 V into 75 W.

Pix Mon Out

±0.5 V into 75 W.

Line strobe; no input signal.

Remote Control

Interface Standard

Control Enable

RS232 / RS422.

Ground Closures and Pre-

sets.

Table 5–2: Waveform Monitor Vertical System

Performance

Supplemental

Information

Characteristics

Requirements

Return Loss

CH A, B1, B2, or B3

>40 dB DC to 5 MHz.

>34 dB DC to 5 MHz.

(Terminated in 75 W.)

Aux Video In, Aux

Video Out, & Pix Mon

Out

Instrument On only.

Ext. Sync Input

>46 dB to 5 MHz.

Loop-Through Isolation

>80 dB at F between

SC,

channels and between

each channel and EXT

REF. Measured externally.

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Specifications

Table 5–2: Waveform Monitor Vertical System (Cont.)

Performance

Supplemental

Information

Characteristics

Requirements

Crosstalk

Typically 70 dB isolation

between channels. Mea-

sured at F between

channels and each channel

and EXT REF.

Frequency Response

Flat (X1)

From 50 kHz Reference:

50 kHz – 5 MHz

1 Volt Full Scale, Variable

Gain off. Adjusted for mini-

mal Luminance/Chromi-

nance gain error. Typically

<0.5%.

Input Ch A, B1,

B2, & B3

±1%.

AUX IN, AUX OUT ±2%.

5 MHz – 10 MHz

Input Ch A

1 Volt Full Scale, Variable

Gain off.

+1%.

Input Ch B1, B2,

and B3

±2%.

AUX IN, AUX OUT ±2%.

10 MHz – 15 MHz

1 Volt Full Scale, Variable

Gain off.

Input Ch A, B1,

B2, & B3

+2%, –5%.

15 MHz – 20 MHz

1 Volt Full Scale, Variable

Gain off. –3 dB at

>20 MHz.

Input Ch A, B1,

B2, & B3

+2%, –15%.

Lum/Chroma Gain

±0.5%

X5 Gain, Modulated Sin

Pulse (12.5T NTSC, 10T

PAL).

Voltage Cursor

Accuracy

0.2%.

1 mV.

Resolution

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Specifications

Table 5–2: Waveform Monitor Vertical System (Cont.)

Performance

Supplemental

Information

Characteristics

Cal Amplitude

Accuracy

Requirements

1.00 V ±0.2%.

NTSC

PAL

0.714 V ±0.5%.

0.700 V ±0.5%.

Resolution

1 mV at 1.00 V.

DC Restorer

Clamp Point

Mains Hum Atten.

Slow Clamp

Fast Clamp

Back porch or Sync Tip.

Attenuation 10%.

≤0.9 dB.

≥26 dB.

Shift caused by pres-

ence or absence of

burst

NTSC = 1 IRE.

PAL = ≤7 mV.

Lum/Chroma Gain Ratio

NTSC

(50 kHz – 3.58 MHz)

1:1 ±1%.

Adjust to minimize lumi-

nance-to-chrominance gain

error at 1 V Full Scale,

typically ≤0.5%.

PAL

1:1 ±1%.

(50 kHz – 4.43 MHz)

Noise Measurements

Accuracy

To 56 dB within 1 dB.

To 60 dB within 2 dB.

Relative to 700 mV

VAR GAIN adjusted to

maximum.

RMS

Offset Accuracy

To 56 dB within 0.5 dB.

To 60 dB within 1 dB.

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Specifications

Table 5–2: Waveform Monitor Vertical System (Cont.)

Performance

Supplemental

Information

Characteristics

Vertical Overscan

Baseline Distortion

Requirements

<7 mV variation in baseline of

chroma when positioned any-

where between sync tip and

100% white.

1 V p-to-p PAL or NTSC

Modulated Sin composite

video signal (12.5T NTSC,

10T PAL).

1.0 or X5, Variable Gain off.

Typically <0.5%.

DC Channel Matching

Typically within 30 mV.

Common Mode Rejection A – B1

B1 – B2 /

B1 – B3

1 V p-to-p common mode

signal.

60 Hz

≥46 dB

≥40 dB

≥34 dB

≥46 dB

≥34 dB

15 kHz (Lum)

1 MHz

A – B1 typically

>46 dB to 6 MHz and

>40 dB to 10 MHz.

3.58 or 4.43 MHz

(Chroma)

Filters

Luminance

<3 dB down at 1 MHz; ≥40 dB

down at 3.58 or 4.43 MHz.

Low Pass

≥14 dB down at 500 kHz.

Typically –3 dB at 300 kHz.

Chrominance

3.58 MHz

±1% of flat at 3.58 MHz.

–3 dB points:

Lower: 2.83 ±0.15 MHz.

Upper: 4.33 ±0.15 MHz.

4.43 MHz

±1% of flat at 4.43 MHz.

–3 dB points:

Lower: 3.68 ±0.15 MHz.

Upper: 5.18 ±0.15 MHz.

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Specifications

Table 5–2: Waveform Monitor Vertical System (Cont.)

Performance

Supplemental

Information

Characteristics

Requirements

Diff Steps

(Differentiated Steps

Attenuation)

>40 dB at 3.58 MHz (4.43 MHz 5 step, 20 IRE staircase

PAL)

within 2% of flat display.

Vertical Gain increase

approximately 5X to

compare staircase risers.

Linear Waveform Distortion

Pulse Preshoot,

Overshoot, & Ringing

≤1% of applied pulse amplitude. Typically:

<0.5% on T Pulse.

<1.0% on T/2 Pulse.

Pulse and Bar

≤1% of applied pulse amplitude. Typically:

<0.5% on T Pulse.

<1.0% on T/2 Pulse.

≤1% of applied bar amplitude.

25 ms Bar Tilt

Field Square Wave Tilt ≤1% of applied square wave

Typically <0.5%.

amplitude.

2T Sin Pulse-to-Bar

Ratio

1:1 ±1%.

Non-Linear Waveform Distortion

Differential Gain

Aux Video Out

Pix Mon Out

≤0.25% at 10% – 90% APL.

Waveform Modes.

≤0.25% at 10% – 90% APL.

Differential Phase

Aux Video Out

Pix Mon Out

≤0.25_ at 10% – 90% APL.

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Specifications

Table 5–3: Waveform Monitor Probe Input

Performance

Supplemental

Information

Characteristics

Input Resistance

Input RC Product

Gain

Requirements

1 MW.

20 ms (20 pF).

Unity 3%.

With gain adjusted for

equivalent 1 V p-to-p dis-

play.

Frequency Response

25 Hz to 5 MHz

5 MHz to 10 MHz

Tilt

±2%.

From 50 kHz Reference.

+3% to –5%.

Less than 5% on 50 Hz square Fast DC restorer eliminates

wave.

low frequency tilt on a

composite video signal.

Probe Calibrator

Waveform

50% Duty Cycle square

wave.

Period

4 horizontal lines.

Output Voltage

1.0 V ±0.5% (0.995 V to

1.005 V).

Impedance Out

≈950 W.

Table 5–4: Waveform Monitor Horizontal Deflection System

Performance

Requirements

Supplemental

Information

Characteristics

Sweep Rates & Timing

Accuracy

Accuracy over center 10 divi-

sions:

±2%.

1 Line (5 ms/Div.)

2 Line (10 ms/Div.)

3 Line (15 ms/Div.)

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Specifications

Table 5–4: Waveform Monitor Horizontal Deflection System (Cont.)

Performance

Requirements

Supplemental

Information

Characteristics

1 Field Sweep

Displays 1 full field includ-

ing vertical interval.

2 Field Sweep

3 Field Sweep

Displays 2 full fields and the

vertical interval between

them. First sweep (left side

of CRT) is selectable be-

tween odd or even fields.

Displays 3 full fields and the

2 vertical intervals between

them. First sweep is select-

able between even or odd

fields, and third field polarity

is the same as that of the

first field.

Sweep Linearity

1 Line (5 ms/Div.)

2 Line (10 ms/Div.)

3 Line (15 ms/Div.)

1 Field Sweep

2 Field Sweep

3 Field Sweep

Slow Sweep

±1%.

±0.5 Division.

±5% of full screen over the

length of the sweep.

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Specifications

Table 5–4: Waveform Monitor Horizontal Deflection System (Cont.)

Performance

Requirements

Supplemental

Information

Characteristics

Magnified Sweep Accuracy

X5 (1 ms/Div.)

±1%.

±2%.

±3%.

±5%.

Applies to the center 10

divisions of unmagnified

sweep. Excludes the first 2

divisions of the magnified

display.

X10 (0.5 ms/Div.)

X20 (0.25 ms/Div.)

X25 (0.2 ms/Div.)

X50 (0.1 ms/Div.)

X100 (50 ns/Div.)

Magnified Sweep Linearity

X5 (1 ms/Div.)

±1 minor division (≤2%).

>20%.

Applies to the center 10

divisions of unmagnified

sweep. Excludes the first 2

divisions of the magnified

display.

X10 (0.5 ms/Div.)

X20 (0.25 ms/Div.)

X25 (0.2 ms/Div.)

X50 (0.1 ms/Div.)

X100 (50 ns/Div.)

Variable Sweep Range

Expands sweep around

center of sweep.

Slow Sweep Duration

4 to 12 seconds. Front-

panel variable control.

Timing Cursor Accuracy

Within 5 ns, any delay within

one line (64 ms).

Line Select

Range

Full Field.

Waveform monitor and

vectorscope may select

different lines. CRT alpha-

numeric identification.

Field Selection

1 of 4 for NTSC or 1 of 8 for

PAL.

Even or Odd and All Fields.

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Specifications

Table 5–4: Waveform Monitor Horizontal Deflection System (Cont.)

Performance

Requirements

Supplemental

Information

Characteristics

RGB/YRGB

Staircase Input

Amplitude

A +10 V input will result in a

horizontal display of 9 divisions corresponds to left side of

±1.4 major divisions.

Ground to +10 V. +10 V

the CRT.

Staircase Operating

Signal

DC Signal levels plus peak AC,

not to exceed –12 to +12 volts.

Max AC signal volts

Sweep Length

RGB

12 V peak-to-peak.

Field or line rate sweeps.

2 Field = 27 – 33% of nor-

mal. 1 Line = 27 – 33% of

normal. 2 Line = 27 – 33%

of normal.

YRGB

2 Field = 20 – 25% of nor-

mal. 1 Line = 20 – 25% of

normal. 2 Line = 20 – 25%

of normal.

Sweep Repetition

Rate

Field or line rate of displayed

Requires 1H or 1Fld sweep

video or external sync signal as selection.

selected by front-panel HOR-

IZONTAL controls.

External Horizontal Input

Sensitivity

Used for ICPM measure-

ments.

Direct coupled 0 – 5 V.

Sawtooth input of up to 5 V

is nominally a 10 division

horizontal sweep.

Input Impedance

≈10 kW.

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Specifications

Table 5–5: Waveform Monitor DG and DP Display

Performance

Supplemental

Information

Characteristics

Differential Gain

Deflection Factor

Requirements

5% dG deflects the trace 50 IRE Waveform gain X1, Var.

(NTSC) or 500 mV (PAL) ±5%. gain off. Vector gain ad-

justed to place chroma at

compass rose.

Residual dG

(10 – 90% APL)

≤0.2%, last 90% of trace.

Calibrated dG

Resolution

CRT readout.

0.1%.

Accuracy

0.1% ±10% of reading.

Range

±5%.

Differential Phase

Deflection Factor

Waveform gain X1, Var.

5_ dP deflects the trace 50 IRE

gain off. Vector gain ad-

justed to place chroma at

compass rose.

(NTSC) or 500 mV (PAL) ±5%.

Residual dP

(10 – 90% APL)

≤0.1_, last 90% of trace.

Calibrated dP

Resolution

Accuracy

CRT readout.

0.05_.

±0.1_ over any 10_ increment.

±0.1_ over full 360_, Ext. Ref.

±0.2_ burst lock.

Range

360_.

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Specifications

Table 5–5: Waveform Monitor DG and DP Display (Cont.)

Performance

Supplemental

Information

Characteristics

Recursive Filter

Noise Reduction

Requirements

≈15 dB signal-to-noise

reduction with filter se-

lected. Assumes white

noise source.

Cross-Luminance

Rejection

≈30 dB with filter selected.

0 dB in dual dP/dG mode.

Unit Sample

Response

Settles to within 1 dB in

<50 lines with a step in

APL. Settles to within 1 dB

in <50 frames in line select.

Chrominance

Bandwidth

500 kHz ±100 kHz base-

band.

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Specifications

Table 5–6: Synchronization

Performance

Supplemental

Information

Characteristics

Sync Input

Internal

Requirements

Ref. Sync

Separator

0.2 to 2.0 V peak-to-peak

composite video.

Composite video applied to

Inputs A, B1, B2, or B3 or

probe.

Int. Sync

Separator

0.5 to 2.0 V peak-to-peak

composite video.

External

Black Burst

–14 dB to +6 dB.

Black Burst signal of 0.2 to

5 times amplitude applied

to EXT SYNC input.

Composite Sync

0.2 to 8.0 V peak-to-peak.

Composite sync applied to

EXT SYNC input locks

waveform monitor; vector-

scope also requires CW

signal.

SCH Modes

Direct Sync

286 mV (300 mV PAL) Sync

and Burst ±3 dB.

Composite Video or Black

Burst.

Horiz. Freq. Range

15.75 kHz ±1 kHz.

Frequencies much below

15.75 kHz will not permit a

normal TV display.

Sync Jitter

Comp sync or

video

≤12 ns with respect to input

sync.

Variable APL

(10–90%)

≤20 ns; with the addition of

36 dB white noise ≤90 ns.

Noise Immunity

<250 ns jitter, 1 V compos-

ite video with –26 dB white

noise.

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Specifications

Table 5–6: Synchronization (Cont.)

Performance

Requirements

Supplemental

Information

Characteristics

AFC Sync

Horiz. Freq. Range

Lock-In Time

Sync Jitter

15.75 kHz ±200 Hz.

<1 second.

Comp sync or

video

≤10 ns; with the addition of

36 dB white noise, ≤12 ns.

Variable APL

(10–90%)

Jitter with respect to

white noise

≤30 ns.

Doubles with each 6 dB

increase in white noise.

Noise Immunity

<90 ns jitter, 1 V composite

video with –26 dB white

noise.

Jitter from missing line

sync pulses

<15 ns per missing sync

pulse. Maximum of 10

consecutive line sync

pulses.

Slow Sweep Triggering

Signal

APL change from ≤10% – 90%. Front panel selectable for

either + or – level change.

Sensitivity

Rate

0.4 V to 2.0 V peak-to-peak

composite video with APL

change.

≥0.2 Hz.

Free runs at rates less than

0.2 Hz or with no triggering

signal.

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Specifications

Table 5–6: Synchronization (Cont.)

Performance

Supplemental

Information

Characteristics

Remote Sync

Amplitude

Requirements

2.0 to 5.0 V square wave, or

4.0 V composite sync.

Input enabled through

rear-panel REMOTE con-

nector.

Input Impedance

Frequency

1 MW.

30/60 Hz (NTSC), 25/50 Hz

(PAL) square wave will

synchronize a 2-field

sweep. Remote sync by-

passes the sync stripper

and field ID circuits.

Table 5–7: Vectorscope Vector Display

Performance

Supplemental

Information

Characteristics

Requirements

Phase Control

Digital Phase Shifter

Phase Accuracy

(External CW signal.)

±0.1_.

0.25_ Burst Lock.

Resolution

0.05_.

Chrominance Bandwidth

Upper –3 dB Point

Lower –3 dB Point

(Subcarrier Frequency)

+500 kHz, ±100 kHz.

NTSC – 3.579545 MHz.

PAL – 4.43361875 MHz.

FSC –500 kHz, ±100 kHz.

Chrominance Transient

Response

Modulated Sin pulse in

R–Y Mode.

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Specifications

Table 5–7: Vectorscope Vector Display (Cont.)

Performance

Supplemental

Information

Characteristics

Requirements

Display

Vector Phase

Accuracy

Measured with color bar

signal.

±1.25_.

Vector Gain Accuracy

Quadrature Phasing

Subcarrier Regenerator

Pull-In Range

±2.5% (1.25 IRE).

±0.5_.

PAL instruments are tested

to 10 Hz, but typically lock

to within 50 Hz.

(NTSC)

±50 Hz of F

(PAL)

±10 Hz of F

Pull-In Time

Within 1 second, with sub-

carrier frequency within

50 Hz (10 Hz for PAL

instruments) of F

Phase Shift with

Subcarrier Frequency

Change

(NTSC)

±0.5_ from F to (F

+50 Hz), or F to (F

–50 Hz).

(PAL)

±0.5_ from F to (F

10 Hz), or F to (F

–10 Hz).

Phase Shift with Burst

Amplitude Change

Internal or External burst

reference.

±2_ from nominal burst ampli-

tude to ±3 dB.

Phase Shift with Input

Channel Change

With EXT REF selected:

Channel A to CH B;

±2_.

Channels B1, B2, B3 to

one another

Phase Control Range

360_ continuous rotation.

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Specifications

Table 5–7: Vectorscope Vector Display (Cont.)

Performance

Supplemental

Information

Characteristics

Requirements

Vector Display

Differential Phase

Differential Gain

≤1_.

≤1%.

Measured with 140 IRE

(1 V) linearity signal with 40

IRE (300 mV) of subcarrier.

Position Control Range

Horizontal

≥1/4I (6 mm) from center.

Vertical

≥1/4I (6 mm) from center.

Clamp Stability

Center Spot movement

with Rotation of PHASE

control.

1/64I (0.4 mm) or less.

Variable GAIN Range

+14 dB to –6 dB of 75% color

bar preset gain.

Unterminated color bar

signal can be brought to

appropriate targets. Burst

from a triple-terminated

signal can be moved to the

compass rose.

Max Gain

>X5.

Variable GAIN Phase

Shift

±1_ as gain is varied from

+3 dB to –6 dB.

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Specifications

Table 5–8: Vectorscope XY Display

Performance

Requirements

Supplemental

Information

Characteristics

Input

DC coupled differential

inputs through rear-panel

connector.

Input Amplitude

2 to 9 V peak-to-peak.

Adjustable full scale deflec-

tion 0 dBm to +12 dBm for

600 W system. Factory set

to 0 dBm.

Maximum Input Voltage

Frequency Response

15 V combined peak signal and

DC.

DC to >500 kHz.

3 dB point.

X and Y Input Phase

Matching

< a trace width of separation at Single-ended. Phase

20 kHz.

matching above 20 kHz

may be improved by adjust-

ing Vertical Deflection

Amplifier VHF Compensa-

tion.

Table 5–9: Vectorscope SCH Phase Display

Performance

Supplemental

Information

Characteristics

Requirements

Accuracy

Absolute

±5_ phase at 25_ C.

Relative

±2_.

Temperature Stability

Acquisition Time

±0.1_ phase/_C.

≤1 sec.

Display Phase Error

Caused by CRT Geome-

try Variations

±1.25_ calibrated for zero

display phase error at zero

SCH phase.

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Specifications

Table 5–9: Vectorscope SCH Phase Display (Cont.)

Performance

Supplemental

Information

Characteristics

Requirements

Input Timing

Stable display with any time

relationship between sig-

nals on CH A, CH B, and

EXT.

Display Range

Ext Reference

Int Reference

360_.

±70_.

Typically >80_.

Table 5–10: CRTs and High Voltage Supplies

Performance

Supplemental

Information

Characteristics

Waveform Monitor

Viewing Area

Requirements

80 × 100 mm. Horizontal

Scale 12.5 Divisions. Verti-

cal Scale 170 IRE (NTSC),

1.19 volts (PAL).

Accelerating Potential

Orthogonality

Nominally 20 kV.

±1_.

Trace Rotation Range

Typical adjustment range is

≥±1_ from horizontal.

≈8_.

Vectorscope

Viewing Area

80 × 100 mm.

Nominally 13.75 kV.

±1_.

Accelerating Potential

Orthogonality

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Specifications

Table 5–11: Power Requirements

Performance

Requirements

Supplemental

Information

Characteristics

Mains Voltage Ranges

110 VAC

90 – 132 V.

Selected by rear-panel

switch.

220 VAC

200 – 250 V.

Mains Frequency Range 48 – 66 Hz.

Crest Factor

≥1.3.

Power Consumption

120 Watts maximum.

Table 5–12: Physical Characteristics

Characteristics

Dimensions

Height

Supplemental Information

5 1/4 inches (133.4 mm).

19 inches (483 mm).

18 inches (460 mm).

Width

Length

Net Weight

Shipping Weight

Approximately 28 lbs (approximately 12.7 kg).

Approximately 45 lbs (approximately 20.1 kg).

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Specifications

Table 5–13: Environmental Summary

Characteristics

Temperature

Operating

Supplemental Information

0_ C to +50_ C.

Non-Operating

Altitude

–55_ C to +75_ C.

Operating

To 2 km maximum.

Vibration

Operating

0.015 inch (0.38 mm) peak-to-peak 10 –55 Hz, 75 minutes total.

Shock

Non-Operating

Bench Handling

Transportation

Vibration

30 g acceleration 3 times each major axis. 11 ms halfsine.

4 inch drop to table top on each of the four bottom corners.

Qualified under National Safe Transit Association (NSTA) Test

Procedure 1A–B–1.

Drop Test

Humidity

Qualified under NSTA Test Procedure 1A–B–2.

90 to 95% Noncondensing.

Equipment Type

Safety Class

Test and measurement

Class I (as defined in IEC 1010–1, Annex H) – grounded

product

Overvoltage Category

Pollution Degree

Overvoltage Category II (as defined in IEC 1010–1, Annex J).

Pollution Degree 2 (as defined in IEC 1010–1).

Note: rated for indoor use only.

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Specifications

Table 5–14: Certifications and compliances

EC Declaration of

Conformity – EMC

Meets intent of Directive 89/336/EEC for Electromagnetic

Compatibility. Compliance was demonstrated to the following

specifications as listed in the Official Journal of the European

Communities:

EN 50081-1 Emissions:

EN 55022Class B Radiated and Conducted Emissions

EN 50082-1 Immunity:

IEC 801-2Electrostatic Discharge Immunity

IEC 801-3RF Electromagnetic Field Immunity

IEC 801-4Electrical Fast Transient/Burst Immunity

High-quality shielded cables must be used to ensure

compliance to the above listed standards.

This product complies when installed into any of the

following Tektronix instrument enclosures:

1700F00 Standard Cabinet

1700F02 Portable Cabinet

1700F05 Rack Adapter

FCC Compliance

Emissions comply with FCC Code of Federal Regulations 47, Part

15, Subpart B, Class A Limits

Installation

(Overvoltage)