Tektronix P7260 Service Manual

Service Manual
P7260 6 GHz 5X/25X Active Probe
071-1113-00
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.
www.tektronix.com
*P071111300*
071111300
Copyright © Tektronix, Inc. All rights reserved. Licensed software products are owned by Tektronix or its suppliers and are protected by United States copyright laws and international treaty provisions.
Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(i i) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the Commercial Computer Software -- Restricted Rights clause at FAR 52.227-19, as applicable.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved.
Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077
TEKTRONIX, TEK, TekConnect, and KlipChip are registered trademarks of Tektronix, Inc.

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.
ToAvoidFireor
Personal Injury
Symbols and Terms
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 measurement 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.
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.
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.
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General Safety Summary
Symbols on the Product. The following symbols may appear on the product:
CAUTION
Refer to Manual
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P7260 6 GHz 5X/25X Active Probe Service Manual

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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P7260 6 GHz 5X/25X Active Probe Service Manual

Preface

Manual Structure

Related Documentation

This is the service manual for the P7260 6 GHz Active Probe. Read this preface to learn how this manual is structured and where you can find other information related to servicing this product.
This manual is available as a printable .pdf file on our website at
www.tektronix.com. Select the Software and Drivers link l ocated on the home page.
This manual contains two sections—Description and Performance Verification and is intended to be used by qualified service personnel. Replaceable parts are limited to accessories and adapters and are described in the User Manual that is shipped with the probe.
Be sure to read the introductions to all procedures. These introductions provide important information needed to do the service correctly, safely, and efficiently.
The probe is shipped with the following manual:
H P7260 6 GHz 5X/25X Active Probe User Manual (Tektronix part number
071-0922-XX)
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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: support@tektronix.com
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, pl ease 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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P7260 6 GHz 5X/25X Active Probe Service Manual

Description

This document describes the Performance Verification procedures for the P7260 6 GHz 5X/25X Active Probe. There are no user-replaceable parts inside the probe. If the probe fails the performance verification procedure, contact your Tektronix service center.

Performance Verification

Use the performance verification procedures to verify the warranted specifica­tions of the P7260 probe. The recommended calibration interval is one year.
The performance verification procedures check the following specifications at 5X and 25X attenuation:
H Output Zero
H DC Gain Accuracy
H Small Signal Risetime
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Description

Equipment Required

Refer to Table 1 for the equipment required to perform the service procedures.
Table 1: Equipment required for performance verification
Item description Performance requirement Recommended example
Sampling Oscilloscope 12.5 GHz bandwidth Tektronix TDS8000
Sampling module (head), with extension cable
Oscilloscope TekConnect Interface Tektronix TDS6604
TekConnect calibration adapter TekConnect Interface 067-0422-XX
Calibration Step Generator 250 mV step, 30 ps rise time 067-1338-XX
Adapter TekConnect-to-SMA TCA--SMA
Adapter Fixture, Probe Calibration 067-1456-XX
DC Power Supply 1VDCat1mA Tektronix PS280
DMM (2) with leads 0.05% accuracy, 0.1 mV resolution Fluke 87 or equivalent
Feedthrough Termination 50 ±0.05 011-0129-XX
BNC-to-BNC coaxial cable 50 coaxial cable 012-0057-01
Coaxial cable Male-to-Male SMA 012-0649-XX
Adapter SMA Male-to-Male 015-1011-XX
Adapter SMA Female-to-Female 015-1012-XX
Adapter SMA Male-to-BNC Female 015-1018-XX
Adapter BNC Female-to-Dual Banana 103-0090-XX
Adapter Y-lead adapter 196-3434-XX
Adapter Square-Pin adapter 016-1910-XX
Adapters (2) SMT KlipChip adapter 206-0364-XX
SMA torque wrench 5/16-in, 7 in-lb.
SMA adapter wrench 7/32-in
Test leads (2) Banana Plug to Banana Plug, Red 012-0031-XX
Test leads (2) Banana Plug to Banana Plug, Black 012-0039-XX
12.5 GHz bandwidth Tektronix 80E0X with 012-1568-00 cable
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P7260 6 GHz 5X/25X Active Probe Service Manual

Special Adapters Required

Some of the adapters listed in Table 1 are custom-made and available only from Tektronix. The adapters are described on the following pages.
Description
TekConnect-to-SMA
Adapter
Probe Calibration Fixture
The TekConnect-to-SMA Adapter, Tektronix part number TCA-SMA, allows signals from an SMA cable or probe to be connected to a TekConnect input. See Figure 1. Connect and disconnect the adapter the same way as you do the P7260 Probe.
Figure 1: TekConnect-to-SMA adapter
The probe calibration fixture, Tektronix part number 015-1456-XX, provides a low-noise method for connecting the P7260 to signals present on SMA cables. The adapter has a test point for the probe and two SMA connectors. A 50 termination is included with the adapter, and is connected to the SMA connector nearest the probe test point to minimize reflections. Connect the cable from the test circuit to the other SMA connector. This fixture includes a probe holder that works to securely hold the probe on the test point. See Figure 2 on page 4.
NOTE. When taking measurements, do not touch the probe tip adapter. Measure­ment accuracy is degraded when the probe tip adapter is handled.
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Description
Probe holder
Probe test point
50
Terminator
Figure 2: Probe calibration fixture
SMA connector
for test circuit
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P7260 6 GHz 5X/25X Active Probe Service Manual
Description
TekConnect Interface
Calibration Adapter
The TekConnect Interface Calibration Adapter, Tektronix part number 067-0422-XX, connects between the host instrument and the probe under test, and provides connectors for probe signal and offset voltage measurements. See Figure 3.
Figure 3: TekConnect Interface Calibration Adapter
When the adapter is connected to the oscilloscope, the adapter is identified as a valid calibration device. However, additional power supplies necessary to power the probe are not enabled until a TekConnect probe is connected to the adapter and identified by the oscilloscope. When a probe is detected through the adapter, the Volts/division readout on the oscilloscope displays ##.
Refer to Table 2 on page 6 for features of the calibration adapter.
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Description
Latch
but
t
Table 2: TekConnect Interface Calibration Adapter features
Feature Description
on
Latch button. The spring-loaded latch mechanically retains the adapter to the oscilloscope. To
Latch
release the adapter, grasp the adapter housing, depress the latch button, and pull the adapter straight out of the oscilloscope.
Offset output select switch. The offset output switch selects between ground and the offset
Offset switch
voltage level from the oscilloscope.
Leave the switch in the ground position for the performance verification procedures.
Offset
voltage
output
GND
VAR
Move the switch to the variable position for the adjustment procedures.
Offset voltage. The offset voltage of the probe is accessed through the BNC connector.
Measure the offset voltage using a DVM, BNC coaxial cable, and BNC-to-dual-banana jack.
Signal out. The SMA connector on the rear of the box allows for direct monitoring of the probe
signal.
Signal out
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P7260 6 GHz 5X/25X Active Probe Service Manual

Performance Verification

Use the following procedures to verify the warranted specifications of the P7260 probe. Before beginning these procedures, refer to page 18, 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 at 5X and 25X:
H Output Zero
H DC Gain Accuracy
H Small Signal Risetime
Electrostatic Discharge (ESD).The P7260 is sensitive to electrostatic discharge. To prevent electrostatic damage when handling the probe, always wear an anti-static wrist strap (provided with your probe), and plug the wrist strap into the ground terminal available on your host instrument or static-approved workstation.

Equipment Setup

Use this procedure to set up the equipment before testing the probe. Refer to the list of required equipment in Table 1 on page 2.
1. Connect the probe calibration adapter to the oscilloscope.
2. Connect the probe to the probe calibration adapter.
3. Turn on the oscilloscope, and enable the channel.
4. Verify that the Volts/division readout on the oscilloscope channel displays ##
(the oscilloscope recognizes the probe through the adapter).
5. Set the multimeter to read DC volts.
6. Allow 30 minutes for the equipment to warm up.
NOTE. To avoid corrupted test results, do not disconnect the probe under test or the probe calibration adapter until you have completed the service procedures. If the probe or adapter are disconnected before completing the procedures, you must reconnect the probe and adapter, and exit and restart the application.
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Performance Verification

Using the Performance Verification Application

While the test equipment is warming up, load the TekConnect Performance Verification application onto your host instrument, or verify that you already have the latest version of the application on your host instrument.
1. Access the Tektronix Website at www.T ektronix.com, and then download the application:
a. On the Tektronix website home page, select the Software & Drivers link.
b. Select the Accessories link, and then click on
ekConnectAdjustSetup.exe
T
2. On the host instrument, open the file TekConnectAdjustSetup.exe. To install the application, follow the instructions that the Install Shield Wizard provides.
3. When installation is complete, go to: Start→Programs→TektronixTekConnect Adjust. Then open TekConnectAdjustSetup.exe.
4. After the application opens, the TekConnect Adjustment Application dialog box appears (see Figure 4).
Figure 4: TekConnect Adjustment Application dialog box
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P7260 6 GHz 5X/25X Active Probe Service Manual
Performance Verification
5. Make the following selections in the TekConnect Adjustment Application dialog box:
a. From the Probe Type to Adjust list, select P7260.
b. From the Channel to Use list, select the oscilloscope channel where the
probe is connected.
c. From the Task to Perform list, select Performance Verification.
6. Click the Continue button. The P7260 Performance Verification dialog box
appears (see Figure 5 on page 9).
NOTE. An error message appears if one of the following conditions exists:
H A probe is not connected to the adapter.
H A probe model other than a P7260 is connected to the adapter.
H The P7260 that is connected to the adapter is defective (unable to properly
communicate with the adapter).
Figure 5: TekConnect Performance Verification dialog box
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Performance Verification
Changing Attenuation for
Performance Verification
Use the Performance Verification application to change the attenuation setting of the P7260 while performing the tests. Keep the Performance Verification dialog box open while you are performing the Performance Verification procedures.
To change the attenuation setting of the probe, click on the button of the attenuation setting you want to use.
To close the P7260 Performance Verification screen, click the Exit button. To close the TekConnect Adjustment application, click Exit again.
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P7260 6 GHz 5X/25X Active Probe Service Manual

Output Zero

Performance Verification
Use this procedure to verify the probe output zero. Perform this test at the 5X attenuation setting of the probe, and then test again at the 25X attenuation setting. Use the same test equipment setup for both tests.
1. Connect the test equipment as shown in Figure 6, below. Short the probe leads together by connecting the KlipChip adapters together.
TDS6604 Oscilloscope
terminator
BNC-SMA
adapter
Set offset switch to GND
KlipChip adapters
TekConnect calibration adapter
Y-lead adapter
P7260 probe compensation box
Square pin adapter
P7260 probe head
BNC-to-Dual
banana adapter
BNC cable
Digital
multimeter
50 precision
Figure 6: Setup for output zero
2. For each P7260 attenuation setting (5X and 25X), repeat steps 3 through 5.
NOTE. To change attenuation settings while performing verification checks, use the radio buttons on the TekConnect Performance Verification dialog box (see page 10 for instructions).
3. Set the offset switch on the calibration adapter to GND.
NOTE. Leave the offset switch in the ground position for all of the performance verification checks.
4. Ground the probe tip by connecting the probe tip to the probe ground socket. (Connecting two KlipChip adapters together is recommended.)
5. Observe the multimeter display, and record the results on the test record. For both 5X and 25X attenuation, the DC level should be 0.000 V ±10 mV.
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Performance Verification

DC Gain Accuracy

Power supply
Perform this test at the 5X attenuation setting of the probe, and then test again at the 25X attenuation setting. Use the same test equipment setup for both tests.
1. Disconnect the KlipChip adapters, and connect the probe input to the DC source, as shown in Figure 7, below. Monitor the source voltage with the digital multimeter DMM #1.
DMM #1 (Vin)
KlipChip adapters
-- +
Black (--)
DMM #2 (V
TDS6604 Oscilloscope
P7260 probe head
Red (+)
)
out
Y-lead adapter
Female BNC-to-male banana adapter
50 precision terminator
Square pin adapter
TekConnect
calibration
50 BNC cable
adapter
P7260 comp box
BNC--SMA adapter
CH 1 input
Figure 7: DC Gain Accuracy setup
2. Repeat the steps 3 through 8 at each attenuation setting (5X and 25X).
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NOTE. To change attenuation settings while performing verification checks, use the radio buttons on the TekConnect Performance Verification dialog box (see page 10 for instructions).
3. Set the input voltage on the DC source to approximately +0.5 V. Record the actual voltage (measured on DMM #1) as V
4. Record the output voltage (as measured on DMM #2) as V
1.
in
1.
out
5. Set the input voltage on the DC source to approximately --0.5 V. Record the actual voltage (measured on DMM #1) as V
2.
in
P7260 6 GHz 5X/25X Active Probe Service Manual
Performance Verification
6. Record the output voltage (measured on DMM #2) as V
7. Calculate the gain as follows: (V
out
1--V
2) ÷ (Vin1--Vin2).
out
out
2.
8. Verify that the gain is:
a. 0.2 ± 2%, for the 5X attenuation setting
b. 0.04 ± 4%, for the 25X attenuation setting
Record the results on the test record.
NOTE. An unacceptable 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 using rise times measured from the test system separately, and the test system including the probe.
Test System Only
1. Connect the test equipment as shown in Figure 8, below. The TDS6604 oscilloscope is only used to power the TekConnect adapter and probe. All settings that follow apply to the CSA8000/TDS8000.
CAUTION. To prevent damage, use care when working with SMA connectors: support equipment to avoid mechanical strain on the connectors, and use a torque wrench when tightening connections.
Sampling head extender cable
80E0X
TDS6604 Oscilloscope
SMA
M-to-M
adapter
CSA8000/TDS8000
TekConnect calibration adapter
TekConnect-to­SMA adapter
Generator remote head
Internal clock output
Calibration
step generator
Trigger input
SMA cable
14
Figure 8: Test system rise time setup
P7260 6 GHz 5X/25X Active Probe Service Manual
Performance Verification
2. Set the oscilloscope trigger to internal clock.
3. Select the channel you have connected to on the 80E0X sampling head, and
then set the oscilloscope vertical scale to 50 mV/division.
NOTE. The output of the step generator rises from a --250 mV level to ground.
4. Adjust the oscilloscope horizontal and vertical position controls to display a signal similar to that shown in Figure 8 on page 14.
5. Set the oscilloscope horizontal scale to 50 ps/div and center the waveform.
6. Use the oscilloscope measurement capability to display rise time. Increase
the stability of the pulse edge measurement by using averaging, if available. 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 (ts) that you measured in step 6 represents the rise time of the test system without the probe.
Test System with Probe
After you assemble the test setup that includes the probe, as shown in Figure 9 on page 16, you will measure the system and probe rise time (t This is used to calculate the probe rise time (t
)instep9.
p
)instep8.
s+p
1. Set the step generator control switch to standby.
2. Remove the TekConnect-SMA adapter from the test setup.
3. Connect the test setup as shown in Figure 9 on page 16.
CAUTION. To prevent damaging the SMA connectors, use a 7/32-inch wrench when connecting and disconnecting the female-to-female SMA adapter.
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Performance Verification
Sampling head extender cable
TDS6604 Oscilloscope
SMA
M-to-M
adapter
80E0X
CSA8000/TDS8000
TekConnect calibration adapter
P7260 probe
comp box
P7260 probe tip
50 terminator
Probe calibration fixture
SMA F-to-F adapter
Generator remote head
Calibration
step generator
Trigger input
Internal clock output
SMA cable
Figure 9: Test system and probe rise time setup
4. Set the step generator control switch to on.
5. Repeat the steps 6 through 11 at each attenuation setting (5X and 25X).
NOTE. To change attenuation settings while performing verification checks, use the TekConnect Performance Verification application (see page 10 for instruc- tions).
6. On the TDS8000, expand the horizontal scale to locate the step edge:
a. Set the vertical scale to
S 10 mV/division for the probe set to 5X attention S 2 mV/division for the probe set to 25 attention
16
b. Adjust horizontal range to 100 ps/division while maintaining the edge
view.
c. For a more stable measurement display, turn averaging on.
P7260 6 GHz 5X/25X Active Probe Service Manual
Performance Verification
7. Adjust the TDS8000 horizontal and vertical position controls to display a signal similar to that shown in Figure 9 on page 16.
NOTE. Do not touch the probe tip adapter when making calibration measure­ments. Measurement accuracy is degraded when the probe tip adapter is handled.
8. Use the TDS8000 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.
9. Calculate the probe-only rise time using the following formula:
tp= t
(s+p)
t
s
2
2
10. Check that the calculated rise time meets the probe specification. The rise time (t
)mustbe:
p
a. 75 ps for the 5X attenuation setting.
b. 85 ps for the 25X attenuation setting.
11. 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:
Mini-
Performance test
Output zero voltage at 5X (± 10 mV error) (at probe output)
± 10 mV (20 _Cto30_C)
Output zero voltage at 25X (± 10 mV error) (at probe output)
± 10 mV (20 _Cto30_C)
DC Gain attenuation accuracy at 5X (2 % error) 196 mV ________ ________ 204 mV
DC Gain attenuation accuracy at 25X (4 % error)
Rise time at 5X (% error) N/A ________ ________ 75 ps
Rise time at 25X (% error) N/A ________ ________ 85 ps
mum
-- 1 0 m V ________ ________ +10mV
-- 1 0 m V ________ ________ +10mV
38.4 mV ________ ________ 41.6 mV
Incom­ing
Outgo­ing
Maxi­mum
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P7260 6 GHz 5X/25X Active Probe Service Manual
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