Instruction Manual
P6249
4 GHz 5X Active Probe
071-0538-03
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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 one (1) year 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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Table of Contents
General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v
vii
Product Description
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contacting Tektronix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1
2
3
Features and Accessories
Configuration
Probe Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
Functional Check
Deskew Fixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Calibration Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check for Hardware Problems . . . . . . . . . . . . . . . . . . . . . . . . . .
15
16
16
17
Operating Basics
Handling the Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Non-destructive Input Voltage . . . . . . . . . . . . . . . . .
Input Linear Dynamic Range . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ground Lead Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
19
19
20
Helpful Hints
Low-Inductance Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SureFoot Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Tip Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
24
25
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Table of Contents
Specifications
Theory of Operation
Probe Head and Cable Assembly . . . . . . . . . . . . . . . . . . . . . . .
36
36
36
36
37
37
Compensation Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Probe Identification EEPROM . . . . . . . . . . . . . . . . . . . . . . . . .
TEKPROBE Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VCC, +7 V Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Verification
Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Attenuation Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rise Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
39
40
41
42
44
Adjustments
Adjustment Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Offset Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
49
50
51
Maintenance
Replacing TEKPROBE Interface Pins . . . . . . . . . . . . . . . . . . .
Removing and Replacing the Compensation Box Covers . . . . .
Removing and Replacing the TEKPROBE Interface Collar . . .
Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation for Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
54
56
57
57
57
Troubleshooting
Replaceable Parts
Parts Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using the Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . .
63
64
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Table of Contents
List of Figures
Figure 1: Dynamic and offset limitations . . . . . . . . . . . . . . . . .
Figure 2: Probe functional check connections . . . . . . . . . . . . . .
12
13
Figure 3: Deskew fixture connections
(two P6249 probes shown) . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 4: Maximum frequency vs. measurement lead length . .
Figure 5: Low-inductance grounding . . . . . . . . . . . . . . . . . . . .
Figure 6: Using a SureFoot adapter for grounding . . . . . . . . . .
Figure 7: Using a probe tip as a test point . . . . . . . . . . . . . . . . .
Figure 8: Typical input impedance and phase versus frequency
Figure 9: Typical bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 10: P6249 simplified schematic diagram . . . . . . . . . . . .
Figure 11: TEKPROBE interface . . . . . . . . . . . . . . . . . . . . . . .
Figure 12: Setup for output zero and DC attenuation accuracy
Figure 13: Test system rise time setup . . . . . . . . . . . . . . . . . . . .
Figure 14: Test system and probe rise time setup . . . . . . . . . . .
Figure 15: P6249 adjustment locations . . . . . . . . . . . . . . . . . . .
Figure 16: 1103 power supply offset voltage location . . . . . . . .
Figure 17: P6249 offset range setup . . . . . . . . . . . . . . . . . . . . .
Figure 18: Replacing TEKPROBE interface pins . . . . . . . . . . .
Figure 19: Removing the compensation box covers . . . . . . . . .
Figure 20: Replacing the compensation box cover . . . . . . . . . .
Figure 21: Replacing the TEKPROBE interface collar . . . . . . .
Figure 22: Compensation box test point locations . . . . . . . . . .
Figure 23: P6249 replaceable parts . . . . . . . . . . . . . . . . . . . . . .
Figure 24: P6249 standard accessories . . . . . . . . . . . . . . . . . . .
Figure 25: P6249 optional accessories . . . . . . . . . . . . . . . . . . .
15
21
23
24
25
28
29
35
37
41
44
45
49
51
52
53
54
55
56
60
65
66
68
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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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Service Safety Summary
Only qualified personnel should perform service procedures. Read
this Service Safety Summary and the General Safety Summary before
performing any service procedures.
Do Not Service Alone. Do not perform internal service or adjustments
of this product unless another person capable of rendering first aid
and resuscitation is present.
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Service Safety Summary
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Product Description
The Tektronix P6249 is a 4 GHz (probe only), 5X active FET probe
with 1 pF input capacitance. The P6249 has a low input capacitance
and high input resistance which minimize circuit loading over a wide
bandwidth range. The small profile and low-mass head of the P6249
make probing crowded circuits by hand fast and easy. The accessory
tips and adapters included with the probe enable the P6249 to be
used on a wide variety of circuit architectures.
The P6249 is powered through a TEKPROBE interface between the
probe compensation box and the oscilloscope. The P6249 can be
used with non-TEKPROBE oscilloscopes and instruments by using
the optional Tektronix 1103 Probe Power Supply.
Options
The following options are available when ordering the P6249 probe:
H Option D1 – Calibration Data
H Option C3 – 3 years Calibration Service
H Option D3 – 3 years Calibration Data
H Option R3 – 3 years Extended Warranty
Standard Accessories
The P6249 is shipped with the following standard accessories:
H Standard probe tips
H SureFoot adapter probe tips
H SureToe adapter probe tips
H SMT KlipChip microcircuit test leads
H Y-lead adapter
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Product Description
H Right-angle adapter
H Three-inch ground lead
H Low-inductance ground pogo pin
H Color marker bands
H SMK4 Micro KlipChip adapters
H .100” square pin adapter
H Instruction manual
Optional Accessories
The following accessories are available for the P6249 probe:
H Deskew fixture
H Probe tip-to-SMA adapter
H 1103 Probe Power Supply
H Compensation box release tool
H Insulated adjustment tool
Refer to Features and Accessories on page 5 for more information on
using the probe and accessories.
For part number information for standard and optional accessories,
refer to Replaceable Parts on page 63.
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Product Description
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
Sales
1-800-833-9200, select option 1*
support
Service
support
1-800-833-9200, select option 2*
Technical
support
Email: [email protected]
1-800-833-9200, select option 3*
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
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Features and Accessories
The P6249 is provided with several features and accessories designed
to make probing and measurement a simpler task. Please familiarize
yourself with these items and their uses.
Probe head assembly. The probe head is
designed for ease of use and high performance.
Its small size makes it easy to handle in tight
areas.
Probe tip
socket
The probe tip socket is sized to easily press onto
0.025 inch pins for direct access. The ground
socket provides a short ground path for high
fidelity ground connections.
Ground
socket
Stabilization
notch
The stabilization notch permits you to use
adjacent pins to reduce stresses on the probe
and pins.
TEKPROBE Interface. The TEKPROBE
interface provides a communication path between
the probe and the oscilloscope. Contact pins
provide power, signal, offset, and probe
characteristic data transfer. See page 37 for more
information.
If your oscilloscope does not support the
TEKPROBE interface, you can use the optional
1103 probe power supply as an effective
interface. Contact your local Tektronix representa-
tive for more information.
Push-in probe tip. Use the push-in probe tip
for general purpose probing by hand. The tip may
also be used as a temporary test point. See
page 25 for more information.
Push-in probe tip
The push-in probe tip may also be used with the
other socketed leads and adapters.
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Features and Accessories
Installing the push-in probe tip. Attach the
push-in probe tip by seating the tip into the probe
tip socket and pushing the tip in until it is seated.
Either end of the tip may be used.
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.
SureFoot probe tip. The SureFoot tip is an
integral probe tip and miniature guide that
enables fault-free probing of fine-pitch SMD
packages. Attach SureFoot adapters the same
way as the push-in probe tips. They can be used
with any of the socketed accessory leads.
The orange, 0.050 inch SureFoot tip is compatible
with 50 mil JEDEC packages such as SOIC,
PLCC, CLCC, etc.
The blue, 0.025 inch SureFoot tip is compatible
with 0.65 mm JEDEC and EIAJ packages.
The red, 0.5 mm SureFoot tip is compatible with
EIAJ packages.
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Features and Accessories
SureToe probe tip. The SureToe tip is a pointed
probe tip useful for probing in dense circuitry.
Attach the SureToe adapters the same way as
the push-in probe tips. Do not force the tip. Also,
be careful not to poke yourself with the sharp
probe tip. They can be used with any of the
socketed accessory leads.
Right-angle adapter. Use the right-angle
adapter for low-profile probing of 0.025 inch
diameter square pins.
The right-angle adapter allows the probe to lie flat
against a circuit board. This enables probing in
vertical circuits such as computer or communica-
tions backplanes, or in tight areas such as
between circuit cards.
The right-angle adapter can be used directly with
the probe head, or attached to the Y-lead adapter
or ground leads.
Right
angle
The right-angle adapter is attached the same way
as the push-in probe tip, and can be easily
removed by hand.
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 pins.
Y-lead
adapter
When selecting the grounding connection,
maintain as short a ground path as possible.
Refer to page 20 for more information.
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
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
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 simply
pulling the pin out by hand.
When selecting the grounding connection,
maintain as short a ground path as possible.
Refer to page 20 for more information.
Low-inductance ground pogo pin. Use the
low-inductance ground pogo pin to substantially
reduce ground lead inductance. Because the
pogo pin simply 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.
When selecting the grounding connection,
maintain as short a ground path as possible.
Refer to page 20 for more information.
Signal-Ground Adapter. The signal-ground
adapter is ideal for use with signal/ground pairs
on 0.100 inch header pins (such as FlexLead
adapters).
Attach the signal-ground adapter by gently
pressing it into the ground socket on the probe
head.
FlexLead
adapter
Be sure to use the stabilization notch whenever
possible, to avoid slipping and damaging the
probe or circuitry under test.
Signal ground
adapter
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Features and Accessories
SMT KlipChip. Use the SMT KlipChip test clips
to access fragile, dense circuitry.
KlipChip
KlipChip test clips can be connected to the Y-lead
or three-inch ground leads. Simply press the lead
socket into the KlipChip handle.
Y-lead adapter
The KlipChip body freely turns, 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.
SMK4 Micro KlipChip adapters. Use the
adapters to probe the leads on integrated circuits
that are surface-mounted.
Color marker
bands
Color marker bands. Attach matching pairs of
the color 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.
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Features and Accessories
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Configuration
The P6249 provides the oscilloscope with the probe model number,
serial number, and attenuation factor. When connected to an
oscilloscope with a TEKPROBE interface, display readouts are
corrected for the probe attenuation factor, the instrument input is set
to 50 W, and the coupling is set to DC.
CAUTION. Do not attempt to install the P6249 on a non-TEKPROBE
connector. Damage to the probe and connector may result. If your
oscilloscope does not support the TEKPROBE interface, use the
optional Tektronix 1103 Probe Power Supply.
If the P6249 is used with the Tektronix 1103 Probe Power Supply, be
sure to have a 50 W termination at the oscilloscope. Also, set the
oscilloscope channel coupling to DC.
The probe offset control is controlled by the oscilloscope. If the
oscilloscope used does not support the TEKPROBE interface, use the
offset controls on the optional Tektronix 1103 Probe Power Supply.
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 1 on page 12 for
more information.
NOTE. See your oscilloscope manual for specific instructions on its
operation and offset control.
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Configuration
To set the probe offset, follow these steps:
1. Set the oscilloscope coupling to GND.
2. Use the vertical position control to set a zero reference level on
the oscilloscope display.
3. Set the oscilloscope coupling to DC and 5 V/div.
4. Attach the probe to the circuit.
5. Adjust the probe offset to bring the trace to the oscilloscope zero
reference.
6. Change the volts/division setting to the desired range, adjusting
the offset to keep the trace on the zero reference level.
NOTE. The P6249 has a 5.0 V offset range. The linear operating
range is 2.0 V. See Figure 1. Also, see page 19 for more informa-
tion.
If cursors are used on a TEKPROBE oscilloscope, the zero reference
will be at the probe offset voltage.
Nonoperating range (+30 V maximum nondestructive input voltage )
+7.0 V
+5.0 V
Maximum offset range
–5.0 V
+5.0 V
+2.0 V
Maximum AC signal amplitude
0 V
–2.0 V
–5.0 V
–7.0 V
Nonoperating range (–30 V maximum nondestructive input voltage )
Figure 1: Dynamic and offset limitations
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Functional Check
After installing the probe on the oscilloscope, a functional check
may be performed using the PROBE COMPENSATION connections
on the front panel of the oscilloscope. Use the optional deskew
fixture for optimum connections. See Figure 2.
A
B
Deskew fixture
Figure 2: Probe functional check connections
1. Connect the probe to the oscilloscope.
2. Set the oscilloscope to display the probe channel.
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Functional Check
3. If you have the optional deskew fixture, connect it to the PROBE
COMPENSATION connections. Connect the probe to the deskew
fixture (see Figure 3 on page 15), and proceed to step 6.
4. Using a ground lead and a SMT KlipChip, connect the probe
ground to the PROBE COMPENSATION ground connection on
the oscilloscope.
5. Using a standard tip, hold the probe to the SIGNAL terminal on
the oscilloscope.
6. Adjust the oscilloscope to display a stable calibration waveform.
NOTE. If your instrument supports probe calibration routines, now is
a good time to perform them. However, certain firmware versions of
TDS series oscilloscopes will return a “Probe Cal Failed” message. If
this occurs, refer to Probe Calibration Errors on page 16.
7. Disconnect the probe from the deskew fixture or SIGNAL
terminal and ground the probe tip. (Connect the KlipChip to the
probe tip.)
8. With the probe offset set to 0.0 V, the oscilloscope display should
be at the ground reference.
9. Set the oscilloscope volts/division to 1 V.
10. Adjust the probe offset. The displayed waveform should vary
between approximately +2.0 V and –2.0 V.
NOTE. If no waveform is displayed, check the vertical coupling to be
sure that it is set to DC.
If the offset adjustment has no effect, set the vertical coupling to DC.
If you are using the Tektronix 1103 Probe Power Supply, and the
waveform is distorted, check to make sure that the oscilloscope
termination is 50 W.
If the probe does not pass this functional check, go to Troubleshoot-
ing on page 59.
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Functional Check
Deskew Fixture
The optional deskew fixture provides a convenient way to connect
the probes in your system to the calibration signal for deskewing.
The deskew fixture is configured to allow you to connect different
probe models to the system. Refer to Figure 3 to see how two P6249
probes are connected.
P6249 probe
Signal
Ground
P6249 probe
Figure 3: Deskew fixture connections (two P6249 probes shown)
For part number information for the deskew fixture, refer to
Replaceable Parts on page 63.
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Functional Check
Probe Calibration Errors
If you get the message “Probe Cal Failed”, or other calibration
anomalies occur, you may be using an oscilloscope that is not fully
compatible with the P6249 probe, or you may have a hardware
problem.
Check Compatibility
Before suspecting a problem with your probe, compare your
oscilloscope firmware version with those listed in Table 1.
Table 1: TDS 500, 600, or 700 series oscilloscopes fully compatible
with the P6249 probe
Model number
Firmware version required
TDS 520D
greater than FV:6.3e
TDS 540D
TDS 580D
TDS 654C
TDS 680C
TDS 684C
TDS 694C
TDS 724D
TDS 754D
TDS 784D
TDS 794D
greater than FV:6.3e
greater than FV:6.3e
FV:5.1e or above
FV:5.1e or above
FV:5.1e or above
all versions compatible
greater than FV:6.3e
greater than FV:6.3e
greater than FV:6.3e
greater than FV:6.3e
NOTE. You can take P6249 probe measurements with any TDS 500,
600, or 700 series oscilloscope, regardless of firmware version. The
fully compatible oscilloscopes listed in Table 1 give you enhanced
accuracy after successfully passing the probe calibration function.
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Functional Check
Other TDS 500, 600, or 700 series oscilloscopes may give the error
message “Probe Cal Failed” when you run the probe calibration
function, but the probe will still meet its warranted specifications.
Check for Hardware Problems
If the firmware version on your TDS 500, 600, or 700 series
oscilloscope is fully compatible with the P6249 probe, do the
following:
1. Perform the Signal Path Calibration on the oscilloscope and wait
for it to complete.
2. Rerun the calibration routine on the P6249 probe.
3. If the oscilloscope returns the failure message again, initialize the
probe calibration and check probe offset zero:
H If offset zero is greater than 25 mV, perform the Offset Zero
adjustment on page 50 in the Adjustments section.
H If offset zero is less than 25 mV, check the Offset Range as
instructed on page 51 in the Adjustments section.
4. Rerun the probe calibration function on the P6249 probe. If the
probe calibration fails, run the calibration on another oscilloscope
channel.
5. If the problem persists, there is a hardware fault. Please contact
your nearest Tektronix Service Center for more information.
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Functional Check
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Operating Basics
Please follow these operating guidelines to get optimum performance
from your P6249.
Handling the Probe
Exercise care when using and storing the P6249. 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, such as kinking, excessive
bending, or pulling. Visible dents in the cable will increase signal
aberrations. Do not drop the probe or subject it to physical shock.
Damage to the probe may result.
Maximum Non-destructive Input Voltage
The P6249 is electrically protected against static voltage; however,
applying voltages above its design limits may damage the probe tip
amplifier. Please refer to Specifications on page 27 for the maximum
operating voltage and frequency derating information.
Input Linear Dynamic Range
The probe head amplifier used by the P6249 has a limited linear
operating range. To keep the input linearity error less than 0.1% you
must limit the apparent signal input voltage to 2.0 V.
Use the DC offset adjustment to maintain the probe within its
dynamic range. The nominal offset adjustment range of the P6249 is
5.0 VDC. For example: to offset a +2 VDC level in a circuit, set the
offset to +2 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 7.0 V (including any DC offset). See
Figure 1 on page 12.
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Operating Basics
Ground Lead Length
When you are probing a circuit, you should always use as short a
ground lead as possible between the probe head and circuit ground.
When you touch your probe tip to a circuit element, you are
introducing a new resistance, capacitance, and inductance into the
circuit. This represents the characteristics of your probe and ground
lead.
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 path. A portion of the ground lead
path is uncontrollable since it is hard-wired on the circuit board
under test.
As a guide, refer to Figure 4 to estimate the maximum frequency you
can measure using additional lead length.
The total inductance can be calculated, with reference to the
measurement loop area formed by the ground lead path, using the
following formula:
A
113
A = Measurement loop area in square inches
L = Inductance in microhenries
L +
Once you have calculated the inductance, use 1 picofarad for the
capacitance of the P6249 and calculate the approximate resonant
frequency (f ) at which this parasitic circuit will resonate, using the
0
following formula:
1
f0 +
Ǹ
2p LC
The preceding equation shows that reducing the ground lead
inductance will raise the resonant frequency. If your measurements
are affected by ringing, your goal is to lower the inductance of your
ground path until the resulting resonant frequency is at least 3 times
greater than the frequency of your measurements.
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Operating Basics
1000
900
800
700
600
500
400
Frequency
(MHz)
300
200
100
0
1
1.2 1.4 1.6 1.8
2
2.2 2.4 2.6 2.8
3
Measurement lead length (Inches)
Figure 4: Maximum frequency vs. measurement lead length
In order to reach two test points with a P6249, a 2-inch length return
ground lead is used. What is the maximum circuit frequency which
should be measured?
Using the graph shown in Figure 4 as a guide, a 2-inch lead length
yields a 500 MHz maximum frequency.
The low-inductance ground contacts described in Accessories 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 a package being probed can
minimize ground lead length and inductance. See Figure 5.
Figure 5: Low-inductance grounding
Attach a small piece of copper clad on top of the package and
connect it to the package ground connection. Use the low-inductance
ground lead provided with the P6249 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 package makes probing
the 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 package under test using a
SureFoot adapter. Refer to Figure 6.
Figure 6: Using a SureFoot adapter for grounding
Use a SureFoot adapter at the end of a short ground lead to connect
directly to the 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 square pin to a
circuit, to be used as a temporary test point. See Figure 7.
Solder the tip onto a lead or pin with a low-power soldering iron.
Press the probe head onto the tip to make a measurement, and then
pull the probe head off when you are done.
The probe tip may be removed and reused by desoldering it from the
circuit, and soldering it into another circuit in the future.
Solder
Figure 7: Using a probe tip as a test point
NOTE. Do not use pieces of solid-core copper wire be used 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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Specifications
These specifications apply to a P6249 probe when used with a
TDS 694C oscilloscope.
The probe and oscilloscope must first be allowed to warm up for
20 minutes before measurements are taken.
CAUTION. Do not apply voltages beyond the non-destructive input
voltage range to the probe. Damage to the probe or circuit under test
may result.
Table 2: Warranted electrical specifications
DC Attenuation Accuracy (probe only)
Output Zero
0.2 2% (excludes offset error)
10 mV or less at output of probe
≤120 ps
Rise Time (probe only)
Table 3: Typical electrical characteristics
Bandwidth, (probe only)
4 GHz (See Figure 9)
Linear Input Dynamic Range
–2.0 V to +2.0 V.
(Equivalent to –0.4 V to +0.4 V
at the output of the probe.)
Linearity
"0.1% over a dynamic range of –1.75 V to
+1.75 V
"1.0% over a dynamic range of –2.0 V to
+2.0 V
–30 V to +30 V (DC + peak AC)
Nondestructive Input Voltage Range
Input Resistance
20 kW at DC. (See Figure 8)
Input Capacitance
1.0 pF
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Specifications
Table 3: Typical electrical characteristics (Cont.)
Offset Range
DC Offset Drift
–5.0 V to +5.0 V
150 mV/°C or less at output of probe
0.75 mV/°C or less displayed on screen with
TEKPROBE interface
DC Offset Scale Accuracy
Delay Time
2% (of 5X actual probe gain)
5.05 ns 0.2 ns
System Noise
300 mV rms or less at output of probe with
probe tip grounded
110°
90°
70°
50°
30°
22 K
20 K
18 K
16 K
14 K
12 K
10 K
Magnitude
10°
–10°
–30°
–50°
–70°
–90°
Phase
8 K
6 K
4 K
2 K
–110°
0
1 M
10 M
100 M
1 G
5 G
Frequency
Figure 8: Typical input impedance and phase versus frequency
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Specifications
Table 4: Physical Characteristics
Net Shipping Weight
Cable Length
1.78 kg (3.93 lb)
1.3 meters
–10
–12
–14
–16
–18
Gain dB
–20
VOUT
VIN
–22
–24
–26
–28
Gain + 20 Log ǒ Ǔ
1 MHz
10 MHz
100 MHz
1 GHz
10 GHz
Frequency
Figure 9: Typical bandwidth
Table 5: Environmental characteristics
Operating Temperature
0° C to +40° C.
The environmental exposure is the procedure stated
in Tektronix Design Standard 062-2847-00 for Class 5
equipment.
Nonoperating Temperature
–40° C to +71° C.
The environmental exposure is the procedure stated
in Tektronix Design Standard 062-2847-00 for Class 5
equipment.
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Specifications
Table 5: Environmental characteristics (Cont.)
Humidity
80% RH at 40° C.
The environmental exposure is as stated in Tektronix
Design Standard 062-2847-00 for Class 5 equipment.
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.
Tektronix standard 062-2858-00, Rev. B, Class 5.
Electrostatic Immunity
IEC 61000-4-2
EMC
IEC 801–3
Altitude
Operating: 15,000 ft.
Non-Operating: 50,000 ft.
Pollution Degree
Pollution Degree 2
Table 6: Certifications and compliances
Category
Standards or description
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
Union:
EN 55011
Class A Radiated and Conducted Emissions
EN 55011
EN 61000-3-2
EN 61000-3-3
Class B Radiated and Conducted Emissions
AC Power Line Harmonic Emissions
AC Power Line Flicker
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Specifications
Table 6: Certifications and compliances (cont.)
Category
Standards or description
EN 50082-1 Immunity:
IEC 61000-4-2 Electrostatic Discharge Immunity
IEC 61000-4-3 RF Electromagnetic Field Immunity
IEC 61000-4-4 Electrical Fast Transient/Burst Immunity
IEC 61000-4-5 Power Line Surge Immunity
IEC 61000-4-6 Radio Frequency Common Mode
IEC 61000-4-8 Power Frequency Magnetic Field
IEC 61000-4-11 Voltage Dips and Interruptions
Australia/New Zealand Complies with EMC provision of Radiocommunications Act
Declaration of
per the following standard(s):
Conformity – EMC
AS/NZS 2064.1/2 Industrial, Scientific, and Medical
Equipment:1992
AS/NZS 3548
Information Technology Equipment: 1995
EMC Compliance
FCC Compliance
Meets the intent of Directive 89/336/EEC for Electromagnetic
Compatibility when it is used with the product(s) stated in the
specifications table. Refer to the EMC specification published for
the stated products. May not meet the intent of the directive if used
with other products.
Emissions comply with FCC Code of Federal Regulations 47, Part
15, Subpart B, Class A Limits.
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Specifications
Table 6: Certifications and compliances (cont.)
Category
Standards or description
Pollution Degree
A measure of the contaminates that could occur in the
environment around and within a product. Typically the internal
environment inside a product is considered to be the same as the
external. Products should be used only in the environment for
which they are rated.
Pollution Degree 1
No pollution or only dry, nonconductive pollution occurs.
Products in this category are generally encapsulated,
hermetically sealed, or located in clean rooms.
Pollution Degree 2
Normally only dry, nonconductive pollution occurs.
Occasionally a temporary conductivity that is caused by
condensation must be expected. This location is a typical
office/home environment. Temporary condensation occurs
only when the product is out of service.
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WARNING
The following servicing instructions are for use only by
qualified personnel. To avoid injury, do not perform any
servicing other than that stated in the operating instructions
unless you are qualified to do so. Refer to all Safety
Summaries before performing any service.
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Theory of Operation
There are no user replaceable parts within the probe or the
compensation box; however, this theory of operation is provided to
assist you in isolating failures to either the probe or the host
oscilloscope. Refer to Figure 10 for the simplified schematic.
Probe head
Compensation box
Oscilloscope
Signal Out
Probe tip
Probe tip
amplifier
Probe ID Out
Clock In
EEPROM
Offset ampifier
1V Offset
Offset
zero
Offset to probe
+5
–5
Offset
gain
+7V
Linear
regulator
+5V
–5V
Ground
Probe
cable
TEKPROBE
Interface
Figure 10: P6249 simplified schematic diagram
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Theory of Operation
Probe Head and Cable Assembly
The probe head assembly contains an active amplifier circuit that
buffers and amplifies the input signal. The amplifier receives power
and an offset level from the compensation box assembly via the
cable assembly.
All signal amplification and buffering is performed in the probe head
assembly. No further amplification takes place in the compensation
box.
Compensation Box
The compensation box contains the following circuits:
H Offset amplifier
H Probe identification EEPROM
H TEKPROBE interface
H V , +7 V linear regulator
CC
Offset Amplifier
The offset amplifier is used to offset the input signal DC component
so that it stays at the optimal point of the probe linear dynamic
range. For more information on the linear dynamic range characteris-
tic, refer to Input Linear Dynamic Range on page 19.
The offset amplifier receives offset information as a 1 VDC voltage
from the oscilloscope. The amplfier then amplifies it to match the
probe characteristics and applies it to the probe head circuit.
The offset amplifier has two adjustments: offset zero and offset gain.
These adjustments rarely need attention; however, detailed
adjustment instructions are in the Adjustment section on page 49.
Probe Identification EEPROM
The probe identification EEPROM is used to configure the
oscilloscope to the probe. The EEPROM receives a clock input from
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Theory of Operation
the oscilloscope, and information about the probe is passed to the
oscilloscope.
TEKPROBE Interface
The TEKPROBE interface provides a communication path between
the probe and the oscilloscope. Contact pins provide power, signal,
offset, and data transfer for the probe identification EEPROM.
V , +7 V Regulator
CC
The +15 V input is regulated to +7 V to supply the IC, V .
CC
Figure 11 shows the TEKPROBE interface pin functions. Refer to
your oscilloscope service documentation for more detailed
specifications.
–15 V
–5 V
Offset
Ground
Signal
Data
Clock
+5 V
+15 V
Figure 11: TEKPROBE interface
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Theory of Operation
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Performance Verification
Use the following procedures to verify the warranted specifications
of the P6249 probe. Before beginning these procedures, refer to
page 47 and photocopy the test record and use it to record the
performance test results. The recommended calibration interval is
one year.
These procedures test the following specifications:
H Output offset voltage
H DC attenuation accuracy
H Rise time
Equipment Required
Refer to Table 7 for a list of the equipment required to verify the
performance of your probe.
Table 7: Equipment required for performance verification
Performance
Requirement
Item Description
Recommended Example
Tektronix TDS 694C
Tektronix 11801
Tektronix SD24
Tektronix 1103
Oscilloscope
TEKPROBE interface
Sampling Oscilloscope
Sampling Head
TEKPROBE Power Supply
Calibration Step Generator
Adapter
067-1338-0X
Probe tip
015-0678-00
DC Power Supply
DMM
1 VDC at 1 mA
0.5% accuracy at 2 VDC
50 W 0.05 W
Tektronix PS280
Tektronix TX3
Feedthrough Termination
011-0129-00
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Performance Verification
Table 7: Equipment required for performance verification (Cont.)
Performance
Requirement
Item Description
Recommended Example
BNC-to-BNC coaxial cable
Coaxial cable
012-1342-00
50 W coaxial cable
Male-to-Male SMA, 20 in
174-1427-00
Precision coaxial cable
Male-to-Male SMA, 1 ns
delay
015-0562-00
Adapter
SMA Female-to-Female
015-1012-00
015-0572-00
103-0090-00
Adapters (2)
Adapter
SMA Female-to-BNC Male
BNC Female-to-Dual
Banana
Adapter
Y-lead adapter
196-3457-00
206-0364-00
Adapters (2)
Klip Chip adapter
Equipment Setup
Use this procedure to set up the equipment to test the probe.
1. Connect the probe to the oscilloscope.
2. Connect a Y-lead adapter with KlipChip adapters attached to the
P6249.
3. Turn on the oscilloscope and enable the channel.
4. Allow 30 minutes for the equipment to warm up.
NOTE. If your oscilloscope has a probe calibration routine, run it
before making any of the following checks. However, certain
firmware versions of TDS series oscilloscopes will return a Probe Cal
Failed message. If this occurs, see Probe Calibration Errors on
page 16 for more information.
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Performance Verification
Output Zero
Use this procedure to verify the probe output zero.
1. Connect the test equipment as shown in Figure 12.
2. Attach the probe to a TEKPROBE interface on the 1103 power
supply.
3. Ground the probe tip by connecting the probe tip to the probe
ground socket. (Connecting two KlipChip adapters together is
recommended.)
4. Set the 1103 offset VAR/0V to 0V.
5. Observe the multimeter display and record the results on the test
record.
The displayed DC level should be 0.00 V 10 mV.
1103
Power supply
Power supply
Digital multimeter
–
+
+
–
50W Precision
terminator
BNC-to-Dual
Banana Adapter
Figure 12: Setup for output zero and DC attenuation accuracy
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Performance Verification
DC Attenuation Accuracy
Use this procedure to verify the probe DC attenuation accuracy.
Before beginning, read the procedure through completely.
1. Connect the test equipment as shown in Figure 12 on page 41.
2. Attach the probe to a TEKPROBE interface on the 1103 power
supply.
3. Set the 1103 offset VAR/0V to 0V.
4. Set the multimeter to read DC volts.
5. Connect the probe tip and ground to the power supply using the
Y-lead and KlipChip adapters.
6. Allow 30 minutes for the equipment to warm up.
Record the results of steps 7 through 10 separately. Use the results to
calculate the DC accuracy of the probe in step 11.
7. Set the power supply to +1.000 V. Record the power supply
output as Vmax.
8. Measure and record the multimeter reading as M1.
9. Set the power supply to –1.000 V. Record the power supply
output as Vmin.
10. Measure and record the multimeter reading as M2.
NOTE. If you are unable to set the power supply precisely, record the
actual readings and determine the absolute difference.
|Vmax – Vmin| = difference.
Divide the difference by 5 to account for the ideal probe attenuation
factor. For example: 0.8 is the difference between +2 and –2, divided
by 5.
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Performance Verification
11. Determine the percent error by using the formula below:
M1 * M2
%Error + [
* 1] 100%
0.4
The calculated error should be ≤2%.
12. Record the results on the test record.
NOTE. An unaccceptable error value may result if a low tolerance
termination is substituted for the recommended termination.
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Performance Verification
Rise Time
This procedure verifies that the probe meets rise time specifications.
The probe rise time is calculated from rise times obtained by
measuring the test system without the probe attached, and the test
system plus the probe.
1. Connect the test equipment as shown in Figure 13.
2. Set the oscilloscope trigger to internal clock.
3. Turn on channel 1 on the SD-24, and then set the oscilloscope
vertical scale to 50 mV/div.
4. Set the oscilloscope horizontal scale to 100 ps/div.
5. Adjust the oscilloscope horizontal and vertical position controls
to display a signal similar to that shown in Figure 13.
BNC to SMA adapter
Precision coaxial cable
1103
Power supply
Calibration
step generator
11801
Input
Output
Trigger Input
Internal
clock output
Generator
remote head
Figure 13: Test system rise time setup
6. Use the oscilloscope measurement capability to display rise time.
Rise time is determined from the 10% and 90% amplitude points
on the waveform. Record the rise time as t
s.
The system rise time (t ) that you measured in step 6 represents the
s
rise time of the test system without the probe.
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Performance Verification
The following steps instruct you to assemble the test setup that
includes the probe, as shown in Figure 14. The system and probe rise
time (t ) that you measure in step 12 is used to calculate the probe
s+p
rise time (t ) in step 13.
p
7. Disconnect the calibration generator remote head from the 1103
power supply input. Remove the SMA-BNC adapter from the
1103 power supply input.
8. Use the BNC locking ring to connect the probe to the 1103 power
supply channel 1 input. Disable the offset control on channel 1 of
the 1103 power supply.
9. Connect the probe tip adapter to the calibration step generator
remote head using the SMA female-female adapter. Insert the
probe tip into the probe tip adapter.
P6249 Probe
50 W Terminator
1103 Power supply
Probe tip adapter
BNC to SMA
adapter
Output Input
Generator remote head
Precision
coaxial cable
11801
Calibration
step generator
Input
Trigger input
Internal
clock output
Figure 14: Test system and probe rise time setup
10. Press the AUTOSET button. Set the vertical to 10 mV/div and
horizontal to 100 ps/div. Turn averaging on.
11. Adjust the oscilloscope horizontal and vertical position controls
to display a signal similar to that shown in Figure 14.
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Performance Verification
NOTE. Do not touch the probe tip adapter when making calibration
measurements. Measurement accuracy is degraded when the probe
tip adapter is handled.
12. Use the oscilloscope measurement capability to display rise time.
Rise time is determined from the 10% and 90% amplitude points
on the waveform. Record the rise time as t
s+p.
13. Calculate the probe only rise time using the following formula:
2
tp + t(s)p)2 * ts
Ǹ
14. Check that the calculated rise time meets the probe specification.
The rise time (t ) must be v120 ps.
p
15. Record the results on the test record.
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Performance Verification
Test record
Probe Model:
Serial Number:
Certificate Number:
Temperature:
RH %:
Date of Calibration:
Technician:
Performance test
Minimum Incoming Outgoing Maximum
Output zero voltage
(at probe output)
– 10 mV
N/A
________ ________ + 10 mV
________ ________ ≤2 %
________ ________ ≤120 ps
10 mV (20_ C to 30_ C)
DC attenuation accuracy
Rise time
N/A
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Performance Verification
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Adjustments
The P6249 has two internal controls: offset zero and offset range.
These controls rarely need to be adjusted, and only should be
changed after a probe calibration and functional check has been
performed on the oscilloscope.
In order to make adjustments to the probe, the compensation box top
cover needs to be removed with the optional release tool. Refer to
page 54. Use the optional adjustment tool for making any adjust-
ments.
Adjustment Locations
Refer to Figure 15 for the location of the offset zero and offset range
controls.
Offset zero
adjust
Offset range
adjust
J1
Figure 15: P6249 adjustment locations
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Adjustments
Offset Zero
Use this procedure to adjust the probe offset zero.
NOTE. If your oscilloscope has a probe calibration routine, clear the
probe calibration constants at this time.
If the offset zero is adjusted, perform a functional check of the offset
range before closing the compensation box.
1. Ground the probe tip by connecting the probe tip to the probe
ground socket.
2. Set the channel vertical offset to 0.00 V.
3. Measure the displayed DC level.
4. Adjust Offset Zero for 0.00 15 mV. ( 3 mV when measured
directly without attenuation factor.)
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Adjustments
Offset Range
Use this procedure to adjust the offset range of the probe. The offset
zero of the probe should be checked before making any adjustment
to the offset range. The offset range of the probe is approximately
–3.5 to +3.5 volts.
1. Power on the 1103 power supply and turn on the offset.
2. Using a DMM, adjust the 1103 offset voltage to –0.5 V. Refer to
Figure 16 for the location of the offset voltage test point.
Offset voltage
Ground
Figure 16: 1103 power supply offset voltage location
3. Connect the equipment as shown in Figure 17. Take care not to
disturb the offset level setting on the 1103 power supply.
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Adjustments
1103
Power supply
Power supply
Digital multimeter
–
+
+
–
50W Precision
terminator
BNC-to-dual
Banana Adapter
Figure 17: P6249 offset range setup
4. Set the DC power supply (using the DMM) to +2.5 VDC.
5. Observe the DC value on the DMM.
6. Adjust Offset Range for a DMM reading of 0 V 5 mV. Refer to
Figure 15 on page 49 for the location of the offset range
adjustment.
NOTE. After the offset zero and offset range have been adjusted,
perform a probe calibration and functional check to verify perfor-
mance.
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Maintenance
This section describes the maintenance and repair procedures for the
P6249.
Replacing TEKPROBE Interface Pins
TEKPROBE interface pins can stick and fail to make contact after
time. Periodically check to see that each of the interface pins move
freely and fully extends out of the interface. If any pin fails to move
freely and fully extend, replace the pin.
To remove a TEKPROBE interface pin, firmly grasp the pointed tip
with pliers and pull the pin out of the connector. See Figure 18.
No tools are required to install a replacement pin. Insert a new pin
into the connector socket as far as possible using finger pressure. If
necessary, seat the pin into the connector by pressing the tip gently
but firmly against a hard surface, such as a wood block or table top.
Figure 18: Replacing TEKPROBE interface pins
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Maintenance
Removing and Replacing the Compensation Box Covers
Follow these steps to open the compensation box.
1. Press the optional release tool pins into the compensation box
cover catches and gently lift the cover off a small distance. Refer
to Figure 19.
2. Hold the open edge apart, and use the tool to open the other side
of the compensation box.
3. With both sides of the box open, gently separate the two halves of
the compensation box.
Optional
release
tool
Cover
catches
Figure 19: Removing the compensation box covers
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Maintenance
To replace the covers, follow these steps:
1. Align the tabs with the notches on the cover halves. Refer to
Figure 20.
2. Press the cover tabs in so that the cover can be lowered.
3. Slide the tabs into the notches.
4. Firmly press the pieces together until the cover catches snap into
place.
Tabs (4)
Figure 20: Replacing the compensation box cover
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Maintenance
Removing and Replacing the TEKPROBE Interface Collar
To remove the TEKPROBE interface collar, firmly grasp the
compensation box body with one hand, and the TEKPROBE
interface collar with the other hand. Firmly pull the interface collar
off.
To replace the interface collar, first note the pin configuration on the
compensation box, and their holes in the interface collar. The group
of three pins fit through the smaller of the two holes in the interface
collar. See Figure 21.
Align the tab to the slot and gently press the two pieces together. See
Figure 21.
Once installed, the TEKPROBE interface collar should rotate freely
to lock and unlock.
Tab
Slot
Figure 21: Replacing the TEKPROBE interface collar
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Maintenance
Inspection and Cleaning
To prevent damage to probe materials, avoid using chemicals that
contain benzine, benzene, toluene, xylene, acetone, or similar
solvents.
Do not immerse the probe or use abrasive cleaners.
Dirt may be removed with a soft cloth dampened with a mild
detergent and water solution, or isopropyl alcohol.
Replacement Parts
Refer to Replaceable Parts on page 63 for a list of customer
replaceable parts. Due to the sophisticated design of the P6249, there
are no user replaceable parts within the probe.
Preparation for Shipment
If the original packaging is unfit for use or not available, use the
following packaging guidelines:
1. Use a corrugated cardboard shipping carton having inside
dimensions at least one inch greater than the probe dimensions.
The box should have a carton test strength of at least 200 pounds.
2. Put the probe into a plastic bag or wrap to protect it from
dampness.
3. Place the probe into the box and stabilize it with light packing
material.
4. Seal the carton with shipping tape.
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Maintenance
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Troubleshooting
This troubleshooting documentation details isolation to either the
probe or the oscilloscope.
NOTE. Certain firmware versions of TDS series oscilloscopes will
return a “Probe Cal Failed” message when you run probe calibration
routines on the P6249 probe. If this occurs, refer to Probe Calibration
Errors on page 16.
To troubleshoot the P6249, the probe must be attached to an
operating TEKPROBE interface oscilloscope with the top cover of
the compensation box removed. Refer to page 54 for instructions on
opening the compensation box.
The oscilloscope should be set to the following settings:
H 50 W termination at instrument.
H DC coupling
CAUTION. Observe caution when probing in the compensation
box. Operating voltages will be present. Be careful not to touch
or ground energized components.
Work at a Level 1 ESD workstation when performing trouble-
shooting. The compensation box contains static sensitive
devices.
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Troubleshooting
Refer to Table 8 for troubleshooting procedures, and Figure 22 for
troubleshooting test points.
Offset zero
adjust
Offset range
adjust
J1
Offset
–5
Data
Clock
+5
+5
(Red)
Ground –5
(Black) (White) (Blue)
Offset
Figure 22: Compensation box test point locations
Table 8: Troubleshooting guide
Symptom
Checks
Result
Action
No Signal Out
Check known signal No signal.
Continue checks
Replace probe.
Go to Probe Power
Probe power OK.
Distorted or
nonlinear signal
Is the instrument set No
to 50 W termination?
Set termination to
50 W, or install a
feedthrough
termination at the
instrument input.
Yes
Continue
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Troubleshooting
Table 8: Troubleshooting guide (Cont.)
Symptom
Checks
Result
Action
Distorted or
nonlinear signal
Is the signal within
linear dynamic
range? See page 19.
No
Set channel vertical
offset to match signal
characteristic.
No Offset Adjust
(Signal present)
Go to Probe Power
row
Probe power OK
Offset input OK
Continue checks
Check variation of
offset input from host
instrument. See
Figure 22. Signal
should vary between
+1 V and –1 V.
Replace probe.
Offset input bad
Check TEKPROBE
interface pins on the
compensation box.
See page 53.
Check TEKPROBE
interface on host
instrument. (Try an
adjacent channel.)
Repair host
instrument
Probe Power
Check the power
test points in the
compensation box.
See Figure 22.
Power OK
Power bad
Continue checks.
Check TEKPROBE
interface pins on the
compensation box.
See page 53.
Check TEKPROBE
interface on host
instrument. (Try an
adjacent channel.)
Repair host
instrument
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Troubleshooting
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Replaceable Parts
This section contains a list of replaceable parts for the P6249. Use
this list to identify and order replacement parts.
Parts Ordering Information
Replacement parts are available from or through your local
Tektronix, Inc. service center or representative.
Changes to Tektronix instruments are sometimes made to accommo-
date improved components as they become available and to give you
the benefit of the latest circuit improvements. Therefore, when
ordering parts, it is important to include the following information in
your order:
H Part number
H Instrument type or model number
H Instrument serial number
H Instrument modification number, if applicable
If a part you order has been replaced with a different or improved
part, your local Tektronix service center or representative will
contact you concerning any change in the part number.
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Replaceable Parts
Using the Replaceable Parts List
The tabular information in the Replaceable Parts List is arranged for
quick retrieval. Understanding the structure and features of the list
will help you find the information you need for ordering replacement
parts.
Item Names
In the Replaceable Parts List, an Item Name is separated from the
description by a colon (:). Because of space limitations, an Item
Name may sometimes appear as incomplete. For further Item Name
identification, U.S. Federal Cataloging Handbook H6-1 can be used
where possible.
Indentation System
This parts list is indented to show the relationship between items.
The following example is of the indentation system used in the
Description column:
1ą 2ą 3ą 4ą 5
Assembly and/or Component
Attaching parts for Assembly and/or Component
(END ATTACHING PARTS)
Detail Part of Assembly and/or Component
Attaching parts for Detail Part
(END ATTACHING PARTS)
Name & Description
Parts of Detail Part
Attaching parts for Parts of Detail Part
(END ATTACHING PARTS)
Attaching parts always appear at the same indentation as the item it
mounts, while the detail parts are indented to the right. Indented
items are part of, and included with, the next higher indentation.
Attaching parts must be purchased separately, unless otherwise
specified.
Abbreviations
Abbreviations conform to American National Standards Institute
(ANSI) standard Y1.1
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Replaceable Parts
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