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.

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

General Safety Summary

Symbols on the Product. The following symbols may appear on the product:

CAUTION

Refer to Manual

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.

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

iii

Service Safety Summary

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

Preface

Manual Structure

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.

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

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

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 Ω ±0.05 Ω 011-0129-XX

BNC-to-BNC coaxial cable 50 Ω 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

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 Ω 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.

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

Description

Probe holder

Probe test point

50 Ω

Terminator

Figure 2: Probe calibration fixture

SMA connector

for test circuit

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.

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

Description

Latch

but

Table 2: TekConnect Interface Calibration Adapter features

Feature Description

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

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.

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

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

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→Tektronix→TekConnect 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

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

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

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.

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 Ω 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.

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

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 Ω precision terminator

Square pin adapter

TekConnect

calibration

50 Ω 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).

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

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

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

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.

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

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

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

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.

)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.

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

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 Ω 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

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

Ꭹ

10. Check that the calculated rise time meets the probe specification. The rise time (t

)mustbe:

a. ≤75 ps for the 5X attenuation setting.

b. ≤85 ps for the 25X attenuation setting.

11. Record the results on the test record.

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

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

38.4 mV ________ ________ 41.6 mV

Incoming

Outgoing

Maximum

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

Tektronix P7260 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

General Safety Summary

Service Safety Summary

Preface

Manual Structure

Related Documentation

Contacting Tektronix

Description

Performance Verification

Equipment Required

Special Adapters Required

Performance Verification

Equipment Setup

Using the Performance Verification Application

Output Zero

DC Gain Accuracy

Rise Time