Tektronix Thermometer P7225 User Manual

User Manual

P7225

2.5 GHz 10X Active Probe

071-1187-01

Warning

The servicing instructions are for use by qualified

personnel only. To avoid personal injury, do not

perform any servicing unless you are qualified to

do so. Refer to all safety summaries prior to

performing service.

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WARRANTY

Tektronix warrants that the systems that it manufactures and sells, (excluding

customer-supplied equipment), will be free from defects in materials and workmanship for

a period of one (1) year. The warranty period shall begin on the date of installation or one

(1) month after the date of shipment, whichever is earlier. If any component of a system

supplied by Tektronix proves defective during the initial one-year period, Tektronix, at its

option, either will repair the defective component without charge for parts and labor, or

will provide a replacement in exchange for the defective component. If any component of

the system is a Tektronix product that is normally sold with a separate warranty, such

separate warranty will apply to the component whenever its terms are more favorable to

the Customer.

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

defect before the expiration of the respective warranty period and make suitable

arrangements for the performance of service. Tektronix will provide such service at

Customer’s site without charge during the warranty period, if the service is performed

within the normal on-site service area. Tektronix will provide on-site service outside the

normal on-site service area only upon prior agreement and subject to payment of all travel

expenses by Customer. When or where on-site service is not available, Customer shall be

responsible for packaging and shipping the defective component to the service center

designated by Tektronix, with shipping charges prepaid. Tektronix shall pay for the return

of the component 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 components 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 system; 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

system 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 system.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE

LISTED SYSTEMS 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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Table of Contents

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

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contacting Tektronix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vii

viii

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TekConnect Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Features and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Functional Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Probe Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Handling the Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maximum Nondestructive Input Voltage . . . . . . . . . . . . . . . . .

Input Linear Dynamic Range . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Effects of Adapters . . . . . . . . . . . . . . . . . . . . . . . . . .

Ground Lead Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ground Lead Inductance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Helpful Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Low-inductance Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SureFoot Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Probe Tip Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix A: Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix B: User Service . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preparation for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix C: Replaceable Parts . . . . . . . . . . . . . . . . . . . . . . .

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Table of Contents

List of Figures

Figure 1: P7225 Probe featuring the TekConnect Interface

Figure 2: Connecting and disconnecting the probe . . . . . . .

Figure 3: Probe functional check connections . . . . . . . . . . .

Figure 4: Dynamic and offset limitations . . . . . . . . . . . . . . .

Figure 5: Typical effects of using a probe tip adapter . . . . .

Figure 6: Waveform distortion from ground lead length . .

Figure 7: Ground lead equivalent circuit . . . . . . . . . . . . . . .

Figure 8: Low-inductance grounding . . . . . . . . . . . . . . . . . . .

Figure 9: Using a SureFoot adapter for grounding . . . . . . .

Figure 10: Using a push-in probe tip as a test point . . . . . . .

Figure 11: Typical input impedance and phase versus

frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 12: Typical bandwidth . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 13: Probe head and compensation box dimensions .

Figure 14: P7225 replaceable parts . . . . . . . . . . . . . . . . . . . .

Figure 15: P7225 standard accessories . . . . . . . . . . . . . . . . .

Figure 16: P7225 optional accessories . . . . . . . . . . . . . . . . . .

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Table of Contents

List of Tables

Table 1: P7225 features and standard accessories . . . . . . . .

Table 2: P7225 optional accessories . . . . . . . . . . . . . . . . . . .

Table 3: Warranted electrical specifications . . . . . . . . . . . . .

Table 4: Typical electrical characteristics . . . . . . . . . . . . . .

Table 5: Physical characteristics . . . . . . . . . . . . . . . . . . . . . .

Table 6: Environmental characteristics . . . . . . . . . . . . . . . .

Table 7: Certifications and compliances . . . . . . . . . . . . . . . .

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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

Connect and Disconnect Properly. Connect the probe output to the

measurement instrument before connecting the probe to the circuit

under test. Disconnect the probe input and the probe ground from the

circuit under test before disconnecting the probe from the measure-

ment instrument.

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.

Connect the ground lead of the probe to earth ground only.

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

covers or panels removed.

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

damage to this product, have it inspected by qualified service

personnel.

Do Not Operate in Wet/Damp Conditions.

Do Not Operate in an Explosive Atmosphere.

Keep Product Surfaces Clean and Dry.

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General Safety Summary

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:

CAUTION

Refer to Manual

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Preface

This is the User Manual for the P7225 probe. This manual provides

operating information, specifications, and a replaceable parts list.

Related Manuals

If you need to do a performance verification or make internal

adjustments to your probe, refer to the P7225 2.5 GHz Active Probe

Service Manual. The manual is a printable pdf file, and is available

on both the Tektronix website and the Optional Applications CD.

The Optional Applications CD is included with Tektronix instru-

ments featuring the TekConnect interface.

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Preface

Contacting Tektronix

Phone

1-800-833-9200*

Address

Tektronix, Inc.

Department or name (if known)

14200 SW Karl Braun Drive

P.O. Box 500

Beaverton, OR 97077

USA

Web site

www.tektronix.com

Sales

support

1-800-833-9200, select option 1*

Service

support

1-800-833-9200, select option 2*

Technical

support

Email: [email protected]

1-800-833-9200, select option 3*

1-503-627-2400

6:00 a.m. - 5:00 p.m. Pacific time

This phone number is toll free in North America. After office

hours, please leave a voice mail message.

Outside North America, contact a Tektronix sales office or

distributor; see the Tektronix web site for a list of offices.

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Product Description

The Tektronix P7225 is a 2.5 GHz, 10X active probe. The P7225 has

a ≤0.8 pF input capacitance and a high input resistance (40 kΩ), to

minimize circuit loading over the specified bandwidth. The small

profile and low-mass head of the P7225 make probing dense

circuitry by hand fast and easy. The accessory tips and adapters

included enable the P7225 to be used on a wide variety of circuit

architectures.

Figure 1: P7225 Probe featuring the TekConnect Interface

TekConnect Interface

The P7225 is powered through a TekConnect Interface between the

probe compensation box and the host instrument. The TekConnect

Interface provides a communication path through contact pins on the

host instrument. Power, signal, offset, and probe characteristic data

transfer through the interface.

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Product Description

When the probe is connected, the host instrument reads EEPROM

information from the probe, identifying the device and allowing the

appropriate power supplies to be powered on. The preamp inputs on

the host instrument are electrostatic discharge protected by

remaining grounded until a valid TekConnect device is detected.

Installation

The TekConnect Interface features a spring-loaded latch that

provides audible and tactile confirmation that a reliable connection

has been made to the host instrument. Slide the probe into the

TekConnect receptacle on the host instrument. The probe snaps into

the host instrument when fully engaged. See Figure 2.

To release the probe from the host instrument, grasp the compensa-

tion box, depress the latch button, and pull out the probe.

Latch

button

Figure 2: Connecting and disconnecting the probe

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Product Description

Options

The following options are available when ordering the P7225 probe:

H Option D1 — Calibration Data Report

H Option C3 — 3 years Calibration Service

H Option D3 — 3 years Calibration Data Report

(requires Option C3)

H Option R3 — 3 years Repair Service

H Option C5 — 5 years Calibration Service

H Option D5 — 5 years Calibration Data Report

(requires Option C5)

H Option R5 — 5 years Repair Service

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Product Description

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Features and Accessories

The P7225 is provided with several features and accessories designed

to make probing and measurement a simpler task. To familiarize

yourself with these items and their uses, refer to Table 1.

WARNING. To avoid injury, use care when handling accessories with

sharp tips.

Table 1: P7225 features and standard accessories

Feature/Accessory

Description

Probe head assembly. The probe head is

designed for ease of use and high performance.

The small size makes it easy to handle in tight

areas.

Ground

socket

Probe tip

socket

The probe tip socket is sized to easily press onto

0.025 inch square pins for direct access. The

ground socket provides a short ground path for

high--fidelity ground connections.

Stabilization

notch

The stabilization notch permits you to use

adjacent pins to reduce stress on the probe and

pins.

TekConnect Interface. The TekConnect

Interface provides a communication path between

the probe and the host instrument. Contact pins

provide power, signal, offset, and probe

characteristic data transfer.

Latch

button

The probe snaps into the host instrument when

fully engaged. To remove, grasp the compensa-

tion box, depress the latch button, and pull the

probe out.

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Features and Accessories

Table 1: P7225 features and standard accessories (Cont.)

Feature/Accessory

Description

Push-in probe tip. Use the push-in probe tip for

general purpose probing by hand.

The push-in probe tip may also be used with the

other socketed leads and adapters.

Push-in probe tip

Tektronix part number: 131-5638-11 (1 set of 10)

Installing the push-in probe tip. Attach the

push-in probe tip by aligning the tip into the probe

tip socket and pushing the tip in until it is seated.

Either end of the tip may be used.

Push-in

probe tip

Do not force the tip. Also, be careful not to poke

yourself with the sharp probe tip. To remove the

tip, gently grab the tip with small pliers, and pull

the tip out.

Low-inductance ground pogo pin. Use the

low-inductance ground pogo pin to substantially

reduce ground lead inductance. Because the

pogo pin only touches the ground reference, you

can easily move the probe to different points on

the circuit under test.

Pogo pin

To attach, press the pogo pin into the probe head

ground socket.

To maintain signal fidelity while probing, use as

short a ground path as possible. Refer to page 21

for more grounding information.

Tektronix part number: 016-1772-10 (1 set of 10)

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Features and Accessories

Table 1: P7225 features and standard accessories (Cont.)

Feature/Accessory Description

Three-inch ground lead. Use the three-inch

ground lead for general probing. The socketed

end of the lead may be connected to any of the

probe tips and adapters or fitted onto 0.025 inch

square pins.

To attach the ground lead, press and rotate the

lead pin connector into the ground socket on the

probe head. The lead may be removed by pulling

the pin out by hand.

Three-inch

ground lead

To maintain signal fidelity while probing, use as

short a ground path as possible. Refer to page 21

for more grounding information.

Y-lead

adapter

Y-lead adapter. Use the Y-lead adapter to extend

the physical reach of the probe and ground when

necessary. The Y-lead adapter accepts any of the

probe tips or adapters, and can be pushed

directly onto 0.025 inch square pins.

When selecting the grounding connection,

maintain as short a ground path as possible.

Refer to page 21 for more information.

Tektronix part number 196-3456-XX

(1 set includes 3 three inch ground leads

and 2 Y-lead adapters)

To attach the Y-lead adapter, gently press the

lead pins into the probe head tip and ground

receptacles. Using the black lead for ground is

recommended.

Y-lead

adapter

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Features and Accessories

Table 1: P7225 features and standard accessories (Cont.)

Feature/Accessory

Description

Customizable ground lead. You can bend or

shorten this ground lead wire.

Customizable

ground lead

NOTE: To ease insertion into the ground socket

of the probe, cut the tip of this ground lead wire at

a 30 to 60 degree angle.

To maintain signal fidelity while probing, use as

short a ground path as possible. Refer to page 21

for more grounding information.

Tektronix part number: 196--3482--XX (pkg of 5)

Adapter spring. Use the adapter spring for

low-profile probing of 0.025 inch square pins.

The adapter spring allows the probe to lie at a

right-angle (flat against a circuit board). This

enables probing in vertical circuits, such as

computer or communications backplanes, or in

tight areas, such as between circuit cards.

The adapter can be used directly with the probe

head or attached to a Y-lead adapter or ground

lead.

Right

angle

adapter

The adapter is attached by pushing the tip into

the probe tip socket until it is seated. The adapter

spring can be easily removed by hand.

Tektronix part number: 016-1774-XX (pkg of 10)

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Features and Accessories

Table 1: P7225 features and standard accessories (Cont.)

Feature/Accessory

Description

Square pin socket. The square pin socket is

ideal for use with signal/ground pairs on 0.100

inch squareheader pins.

Attach the socket by gently pressing it into the

ground socket on the probe head.

Square pin

socket

Be sure to use the stabilization notch whenever

possible to avoid slipping and damaging the

probe or circuitry under test.

Tektronix part number: 016-1773-10 (pkg of 10)

SureToe probe adapter (4 ea). The SureToe

adapter is a pointed probe tip useful for probing in

dense circuitry. Attach the SureToe adapters the

same way as the push-in probe tips.

SureToe adapter

Do not force the adapter. Also, be careful not to

poke yourself with the sharp probe tip. SureToe

adapters can be used with any of the socketed

accessory leads.

Tektronix part number: ST501 (pkg of 12)

SMT KlipChip. Use the SMT KlipChip test clips

to access fragile, dense circuitry.

KlipChip

You can connect the KlipChip test clips to a

Y-lead or three-inch ground leads. To connect,

press the lead socket into the KlipChip handle.

Y-lead adapter

The KlipChip body turns freely, allowing better

probe orientation. To reduce stress and provide a

lower profile on components being tested, the

flexible sleeve of the KlipChip bends up to a

35 degree angle.

Tektronix part number: 206-0364-XX (2 each)

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Features and Accessories

Table 1: P7225 features and standard accessories (Cont.)

Feature/Accessory

Description

Cable marker bands. Attach matching pairs of

the marker bands onto the cable at the head and

compensation box of each probe. The marker

bands enable quick verification of which probe is

connected to which instrument channel.

Cable marker

bands

Tektronix part number: 016-1315-XX (pkg of 10)

Antistatic wrist strap. When using the probe,

always work at an antistatic work station and

wear the antistatic wrist strap.

Tektronix part number: 006-3415-XX

Plastic accessory box. Use the plastic box to

store the probe accessories when not in use.

Tektronix part number: 006-7164-XX

Instrument case. The instrument case protects

the probe from harsh environments.

Tektronix part number: 016-1879-XX

User Manual. Provides specifications and

instructions for operating the probe, and a list of

accessories and adapters.

Tektronix part number: 071-1187-XX

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Features and Accessories

Table 1: P7225 features and standard accessories (Cont.)

Feature/Accessory Description

Accessory reorder sheet.

Use the accessory reorder sheet as a quick guide

for ordering accessories for your probe. The

sheet provides photos and part numbers for

identifying your accessories.

Tektronix part number 001-1258-XX

Calibration certificate. A certificate of traceable

calibration is provided with every instrument

shipped.

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Features and Accessories

Table 2 lists the optional accessories you can order for your P7225

probe.

Table 2: P7225 optional accessories

Accessory

Description

SureFoot probe adapter. The SureFoot adapter

is an integral probe tip and miniature guide that

enables fault-free probing of fine-pitch SMD

packages.

SureFoot

adapter

Attach SureFoot adapters the same way as the

push-in probe tips. Three models of SureFoot

adapters are available for the probe and can be

used with any of the socketed accessory leads.

SF501. The orange SureFoot adapter is

compatible with 50 mil JEDEC packages, such as

SOIC, PLCC, CLCC, and so on.

Orange

SureFoot

adapter

Tektronix part number: SF501 (pkg of 12)

SF502. The blue SureFoot adapter is compatible

with 0.25 mil JEDEC and EIAJ packages.

Blue

SureFoot

adapter

Tektronix part number: SF502 (pkg of 12)

SF503. The red SureFoot adapter is

compatible with 0.05 mm EIAJ packages.

Red

SureFoot

adapter

Tektronix part number: SF503 (pkg of 12)

Micro KlipChip adapters. Use the adapters to

probe the leads on integrated circuits that are

surface mounted.

Tektronix part number: SMK4 (pkg of 4)

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Features and Accessories

Table 2: P7225 optional accessories (Cont.)

Accessory Description

TekConnect Interface calibration fixture. The

calibration fixture is required when a performance

verification or adjustment is done on the probe. It

provides connectors and test points for internal

probe measurements.

Tektronix part number: 067-0422-XX

SMA-to-probe tip adapter. Use the adapter to

connect the probe to SMA cables and for

calibration and performance verification. The

adapter includes a 50-ohm SMA terminator.

Tektronix part number: 015--0678--XX

IEEE1394 Adapter. The IEEE1394 Adapter

allows you to probe signals on the bus, external

to system enclosures, without disturbing system

operation. The adapter maintains a balanced

50-ohm signal path and can be used in both

single-ended and differential modes.

Tektronix part number: 679-5027-XX

PPM100 Probe Positioner. The PPM100 is a

general purpose bench top probe holder with

flexible arm, designed for hands-free probing and

fine positioning adjustments. The heavy duty base

can be replaced with the clamp for securing the

probe arm in a variety of situations. Use flexible

retention rings to attach the probe to the probe

holder.

Tektronix part number: PPM100

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Features and Accessories

Table 2: P7225 optional accessories (Cont.)

Accessory

Description

Probe Calibration and Deskew Fixture. This

fixture provides an edge source to time align

(deskew) and to optimize host instrument gain

and offset accuracy at the probe tip.

Tektronix part number: 067-0405-XX

Deskew Fixture. This fixture provides an edge

source to time align (deskew) and to optimize

host instrument gain and offset accuracy at the

probe tip. The probes are held in place allowing

hands-free operation without requiring a probe

arm.

Tektronix part number: 067-0484-XX

Calibration software and instructions.

Use the Optional Applications Software CD that is

shipped with host instruments featuring the

TekConnect interface. Alternatively, you can

download the software from the Tektronix

website, or order the CD using the part number

below.

Tektronix part number: 063-3376-XX

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Functional Check

A functional check may be performed using the PROBE COM-

PENSATION connections on the front panel of the host instrument.

See Figure 3.

NOTE. If you are not familiar with the operation of the host

instrument, please refer to the user manual for the host instrument.

Figure 3 illustrates the probe compensation connection for TDS6000

and TDS7000 instruments. Your instrument may differ from Figure 3.

Please refer to your host instrument for the exact location of the

probe compensation connection.

Figure 3: Probe functional check connections

1. Connect the probe to a channel on the TekConnect host

instrument.

2. Set the host instrument to display the probe channel.

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Functional Check

3. Using a ground lead and SMT KlipChip, connect the probe

ground to the instrument ground on the host instrument.

4. Using a standard tip, hold the probe to the center conductor of the

PROBE COMPENSATION output on the host instrument.

5. Press AUTOSET, or adjust the host instrument to display a stable

calibration waveform. (You may need to adjust the probe offset to

display the waveform.)

NOTE. Now is a good time to perform a probe calibration routine

from your instrument. Refer to the online help of your host instrument

for calibration routine procedures.

6. Disconnect the probe tip from the host instrument, and ground the

probe tip. (Connect the KlipChip to the probe tip.)

7. Set the probe offset to 0.0 V to make the host instrument display

at the ground reference.

8. Adjust the V/div to keep the waveform on the screen.

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Configuration

The P7225 provides the host instrument with the probe model

number, serial number, and attenuation factor. When connected to a

host instrument with a TekConnect Interface, display readouts are

corrected for the probe attenuation factor, the instrument input is set

to 50 Ω, and the coupling is set to DC. The probe offset control is

controlled by the host instrument.

Probe Offset

The probe offset is adjustable to permit operation within the linear

range of the probe. Using the offset to cancel DC signal components

enables optimal probe performance. See Figure 4 on page 18 for

more information.

NOTE. See your host instrument manual for specific instructions on

its operation and offset control.

To set the probe offset, follow these steps:

1. Ground the input of the probe.

NOTE. The probe must be terminated with low impedence (<100 Ω)

to correctly display offset voltage.

2. Use the vertical position control to set a zero reference level on

the host instrument display.

3. Set the host instrument to 1 V/div.

4. Attach the probe to the circuit.

5. Adjust the probe offset to bring the trace to the host instrument

zero reference.

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Configuration

6. Change the volts/division setting to the desired range, adjusting

the offset to keep the trace on the zero reference level.

NOTE. The P7225 has a 10.0 V offset range. The input voltage

linear operating range is 4 V. See Figure 4.

If cursors are used on a TekConnect Interface host instrument, the

zero reference will be at the probe offset voltage.

Nonoperating range (+30 V maximum nondestructive input voltage )

+10.0 V

+14.0 V

+10.0 V

+4.0 V

Maximum AC signal amplitude

Maximum offset range

0 V

- 4 . 0 V

-10.0 V

-14.0 V

-10.0 V

Nonoperating range (-30 V maximum nondestructive input voltage )

Figure 4: Dynamic and offset limitations

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Operating Basics

Please follow these operating guidelines to get optimum performance

from your P7225 probe.

Handling the Probe

Exercise care when using and storing the P7225. The probe and cable

are susceptible to damage caused by careless use. Always handle the

probe using the compensation box and probe head, avoiding undue

physical strain to the probe cable.

NOTE. To reduce the likelihood of creating signal aberrations, be

careful not to dent, kink, pull or stretch the cable.

CAUTION. To prevent damage to the probe, do not drop the probe or

subject it to physical shock.

Maximum Nondestructive Input Voltage

CAUTION. To avoid damage to the probe tip amplifier, do not apply

voltages above the maximum non-destructive input voltage.

Refer to Specifications on page 29 for the maximum operating

voltage and frequency derating information.

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Operating Basics

Input Linear Dynamic Range

The probe head amplifier used by the P7225 has a limited linear

operating range. The usable dynamic range is 4.0 V however, to

keep the input linearity error less than 0.1%, you must limit the

apparent signal input voltage to 3.75 V. If you use the full signal

input voltage of 4.0 V, then the input linearity error increases to

1.0%.

Use the DC offset adjustment to maintain the probe within the

dynamic range. The nominal offset adjustment range of the P7225 is

10.0 V.

NOTE. The probe can tolerate input voltages of 30 V without

damage; however, the linearity error specification does not apply to

input voltages exceeding 14.0 V (including any DC offset). See

Figure 4 on page 18.

Electrical Effects of Adapters

The probe tip adapters included with your probe help connect to

different types of components. While these adapters make connec-

tions easier, be aware that the adapter you choose may affect the

signal that you are measuring, depending on a variety of factors,

including signal frequency, source impedance, and lead length.

Use the probe without adapters to optimize step and frequency

response. Using the probe tip adapters adds inductance and

capacitance, which increase step response and aberrations, and leads

to increased ripples in frequency response. These effects increase as

the source impedance increases and measured waveform risetimes

decrease.

Figure 5 on page 21 illustrates the typical effects on a given signal

using some of the adapters included with your probe.

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Operating Basics

Test pulse without probe

Probe with only short ground pogo pin

3 in Ground lead on square pin

1.7 in Y lead adapter with 2 SMT KlipChips

Figure 5: Typical effects of using a probe tip adapter

Ground Lead Length

When you are probing a circuit, always use as short a ground lead as

possible between the probe head and circuit ground.

The series inductance added by the probe tip and ground lead can

result in a resonant circuit; this circuit may cause parasitic ringing

within the bandwidth of your host instrument. Refer to Figure 6.

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Operating Basics

Test pulse without probe

Square pins on test board (no signal or ground length)

Probe with only short ground pogo pin

1.7 in Y lead adapter

3.0 in Ground lead with SMT KlipChip

Figure 6: Waveform distortion from ground lead length

Ground Lead Inductance

When you touch your probe tip to a circuit element, you are

introducing a new resistance, capacitance, and inductance into the

circuit. Refer to Figure 7 on page 23.

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Operating Basics

Probe C

≤0.8 pF

source

L (ground lead)

Figure 7: Ground lead equivalent circuit

Ringing and rise time degradation can be masked if the frequency

content of the signal degradation is beyond the bandwidth of the host

instrument.

You can determine if ground lead effects may be a problem in your

application if you know the self-inductance (L) and capacitance (C)

of your probe and ground lead. Calculate the approximate resonant

frequency (f₀) at which this parasitic circuit will resonate with the

following formula:

f₀=

Ꭹ

2π LC

The preceding equation shows that reducing the ground lead

inductance will raise the resonant frequency. If your measurements

are affected by ringing, lower the inductance of your ground path

until the resulting resonant frequency is well above the frequency of

your measurements.

The low-inductance ground pogo pin described in Features and

Accessories starting on page 5 can help you reduce the effects of

ground lead inductance on your measurements.

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Operating Basics

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Helpful Hints

Follow these helpful hints to make probing easier and noise free.

Low-inductance Grounding

Placing a ground plane on top of the IC package being probed can

minimize ground lead length and inductance. See Figure 8.

Figure 8: Low-inductance grounding

Attach a small piece of copper clad wire on top of the IC package

and connect it to the IC package ground connection. Use the

low-inductance ground pogo pin or the customizable ground lead to

keep the ground lead length as short as possible.

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Helpful Hints

This method is very useful when making many measurements on the

same package. Using a ground plane on the IC package makes

probing the IC package easier and avoids adding unnecessary ground

lead length and distortion.

SureFoot Grounding

If you cannot use the recommended low-inductance grounding

method, you may ground the probe to the IC package under test

using a SureFoot adapter. Refer to Figure 9.

Figure 9: Using a SureFoot adapter for grounding

Use a SureFoot adapter at the end of a short ground lead to connect

directly to the IC package ground. This method is preferred over

using an adjacent circuit ground because it is the shortest ground

path possible.

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Helpful Hints

Probe Tip Test Points

You can solder the push-in probe tip or a 0.025 inch square pin to a

circuit, to be used as a temporary test point. See Figure 10.

Solder the push-in probe tip onto a lead or pin with a low-power

soldering iron. Press the probe head onto the push-in probe tip to

make a measurement. Pull the probe head off of the push-in probe tip

when you are done.

You can remove and reuse the push-in probe tip by desoldering it

from the circuit, and soldering it into another circuit in the future.

Solder

Figure 10: Using a push-in probe tip as a test point

NOTE. Do not use pieces of solid-core copper wire as test points. If

the wire breaks off in the probe tip socket, it may be impossible to

remove the wire, and it will prevent insertion of other accessory tips.

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Helpful Hints

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Appendix A: Specifications

The probe and host instrument must first be allowed to warm up for

20 minutes before measurements are taken.

Specifications

CAUTION. To prevent damage to the probe or circuit under test, do

not apply voltages beyond the nondestructive input voltage range to

the probe.

Table 3: Warranted electrical specifications

Output Zero

10 mV or less at output of probe

≤140 ps

Rise Time (probe only)

DC Gain Accuracy (probe only)

0.1 2% (excludes offset error)

Table 4: Typical electrical characteristics

Bandwidth, (probe only)

2.5 GHz (See Figure 12)

Linear Input Dynamic Range

--4.0 V to +4.0 V

(Equivalent to --400 mV to +400 mV

at the output of the probe.)

Delay Time

5.3 ns 0.2 ns

Offset Range

System Noise

--10.0 V to +10.0 V

300 ꢀV_rmsor less at output of probe with

probe tip grounded

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Appendix A: Specifications

Table 4: Typical electrical characteristics (Cont.)

Linearity

ᐔ0.1% over a dynamic range of

--3.75 V to + 3.75 V

ᐔ1.0% over a dynamic range of

--4.0 V to + 4.0 V

--30 V to +30 V (DC + peak AC)

Nondestructive Input Voltage Range

Input Resistance

40 kΩ (See Figure 11 for impedance vs.

frequency)

Input Capacitance

DC Offset Drift

≤0.8 pF

150 ꢀV/°C or less at output of probe

0.75 mV/°C or less displayed on screen with

TekConnect Interface

DC Offset Scale Accuracy

2% (of 10x actual probe gain)

DC Voltage Measurement Accuracy,

referred to input

(2% of input + (2% of offset) + 100 mV

output offset + 80 mV linearity error)

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Appendix A: Specifications

Input Impedance

45 KΩ

110 °

90 °

40 KΩ

70 °

50 °

30 °

35 KΩ

30 KΩ

25 KΩ

10 °

0 °

- 1 0 °

20 KΩ

- 3 0 °

- 5 0 °

- 7 0 °

15 KΩ

10 KΩ

5 KΩ

- 9 0 °

0 KΩ

- 11 0 °

10 KHz

100 KHz

1 MHz

10 MHz

100 MHz

1 GHz

10 GHz

Magnitude

Phase

Frequency (Hz)

Figure 11: Typical input impedance and phase versus frequency

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Appendix A: Specifications

- 1 7

- 2 0

- 2 3

V_OUT

_{Gain = 20 Log}Ꮛ Ꮠ

V_IN

- 2 6

- 2 9

- 3 2

10 MHz

100 MHz

1 GHz

10 GHz

Frequency

Figure 12: Typical bandwidth

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Appendix A: Specifications

7.6 mm

(0.300 in)

31.8 mm

(1.250 in)

57.2 mm

(2.250 in)

7.6 mm

(0.300 in)

43.8 mm

(1.725 in)

63.5 mm

(2.500 in)

91.5 mm

(3.600 in)

Figure 13: Probe head and compensation box dimensions

Table 5: Physical characteristics

Net weight

1.41 kg (3.1 lbs)

1.3 m (50 in)

Cable length

Table 6: Environmental characteristics

Operating temperature

Nonoperating temperature

Humidity

0 °C to +40 °C (+32 _F to +104 _F)

-- 5 5 °C to +75 °C (--67 _F to +167 °F)

0 to 90% RH at +30 °C to +40 °C (+86 _F to

+104 _F)

Packaged product vibration and

shock

The packaged product qualifies under the Distribution

Cycle 1 Assurance Level II for packaged products 0 to

20 lbs. Test 2 for Warehouse and Vehicle Stacking

(Compression) is omitted.

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Appendix A: Specifications

Table 7: Certifications and compliances