Tektronix P7350 Primary User

Instruction Manual

P7350
5 GHz Differential Probe

071-1238-00

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

Copyright © Tektronix, Inc. All rights reserved.

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 cha nge privileges reserved.

Tektronix, Inc., P.O. Box 500, Beaverton, OR 97077

TEKTRONIX, TEK, SureFoot, and TekConnect are registered trademarks of
Tektronix, Inc., and KlipChip is a trademark of Tektronix, Inc.

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.

Preface

This is the Instruction Manual for the P7350 differential probe.
This manual provides operating information, specifications, and a
replaceable parts list.

P7350 5 GHz Differential Probe Instruction Manual

i

Preface

Contacting Tektronix

Phone [phone]*

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

Service
support

Technical
support

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

hours, please l eave a voice mail message.
Outside North America, contact a Tektronix sales office or
distributor; see the Tektronix web site for a list of offices.

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

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

Email: [e-mail]

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

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

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P7350 5 GHz Differential Probe Instruction Manual

Table of Contents

Preface i............................................

Contacting Tektronix ii.................................

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

Service Safety Summary vii..............................

Getting Started 1.....................................

TekConnect Interface 1.................................

Functional Check 3....................................

Options 4............................................

Features and Standard Accessories 5......................

Optional Accessories 9.................................

Operating Basics 11...................................

Input Voltage Limits 12.................................

Common-Mode Rejection 12.............................

Probing Techniques to Maximize CMRR 13.................

Input Impedance and Probe Loading 14.....................

Probe Grounding 15....................................

Electrical Effects of Accessories 16........................

Reference 17.........................................

Problems with Single-Ended Measurements 17...............

Differential Measurements 17............................

Extending the Input Leads 19.............................

Extending the Ground Lead 20............................

Appendix A: Specifications 21...........................

Appendix B: Performance Verification 29.................

Appendix C: Maintenance 43...........................

Appendix D: Replaceable Parts 45.......................

P7350 5 GHz Differential Probe Instruction Manual

iii

Table of Contents

List of Figures

Figure 1: P7350 differential probe featuring the

TekConnect interface 1..............................

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

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

Figure 4: Protect the probe tips with the protective cover 11....

Figure 5: Using the variable spacing adapter 13..............

Figure 6: Using the TwinFoot adapter 13....................

Figure 7: Typical probe input model 14.....................

Figure 8: Probe ground input 15...........................

Figure 9: Typical effects on a signal using probe tip adapters 16.

Figure 10: Simplified model of a differential amplifier 18......

Figure 11: Twisting the input leads 20......................

Figure 12: Typical common- and differential-mode gain plots 24
Figure 13: Typical differential input impedance vs frequency 25.

Figure 14: Typical bandwidth 25..........................

Figure 15: Probe head and compensation box dimensions 27....

Figure 16: Variable spacing adapter dimensions 28............

Figure 17: Square pin adapter dimensions 28................

Figure 18: TekConnect Interface Calibration Adapter 31.......

Figure 19: Probe Calibration Fixture 33.....................

Figure 20: Probe Calibration Fixture test points 34............

Figure 21: Setup for the output offset voltage test 35..........

Figure 22: DC Gain Accuracy setup 36.....................

Figure 23: Test system rise time setup 38...................

Figure 24: Test system rise time setup with probe 40..........

Figure 25: Verifying both probe pins are contacting the

DM test points 41...................................

Figure 26: P7350 replaceable parts 47......................

Figure 27: P7350 standard accessories 49...................

Figure 28: P7350 optional accessories 51...................

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P7350 5 GHz Differential Probe Instruction Manual

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.

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 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 be fore making connections to the product.

The common terminal is at ground potential. Do not connect the
common terminal to elevated voltages.

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.

P7350 5 GHz Differential Probe Instruction Manual

v

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 ha zard to property including the product.

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

CAUTION

Refer to Manual

vi

P7350 5 GHz Differential Probe Instruction Manual

Service Safety Summary

Only qualified personnel should perform service procedures. Re ad
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 capabl e of rendering fi rst aid
and resuscitation is present.

P7350 5 GHz Differential Probe Instruction Manual

vii

Service Safety Summary

viii

P7350 5 GHz Differential Probe Instruction Manual

Getting Started

The P7350 is a high-bandwidth (5 GHz typical), active differential
probe with a miniaturized probe head design. The probe has low
circuit loading, high common-mode rejection, and ships with a
variety of accessories for connecting to surface-m ount device s and
other components.

Figure 1: P7350 differential probe featuring the TekConnect interface

TekConnect Interface

The P7350 probe is powered through a TekConnect interface
between the probe compensation box and the host instrument. The
TekConnect interface provides a communication path through
contact pins on the host instrument. Power, signal, offset, and probe
characteristic data transfer through the interface.

P7350 5 GHz Differential Probe Instruction Manual

1

Getting Started

When the probe is connected, the host instrument reads EEPROM
information from the probe, identifying the device and allowing the
appropriate power supplies to be turned on. The preamp inputs on the
host instrument are ESD protected by remaining grounde d until a
valid TekConnect device is detected.

The TekConnect interface features a spring-loaded latch that
provides audible and tactile confirmation that a reliable connection
has been made to the host instrument. Slide the probe into the
TekConnect receptacle on the host instrument. The probe snaps into
the receptacle when fully engaged. See Figure 2.

To release the probe from the host instrument, grasp the compensa­tion box, press the latch button, and pull out the probe.

Latch button

Figure 2: Connecting and disconnecting the probe

2

P7350 5 GHz Differential Probe Instruction Manual

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. Figure 3 shows a method for
connecting the probe to a typical compensation connector.

Getting Started

Figure 3: Probe functional check connections

1. Connect the probe to the oscilloscope.

2. Set the oscilloscope to display the probe channel.

3. Connect the square pin adapter to the probe tip, and connect the

Y-lead adapter to the square pin adapter. Plug the SMT KlipChips
into the Y-lead adapter.

4. Connect the SMT KlipChips to the PROBE COMPENSATION

connections on the oscilloscope.

5. Adjust the oscilloscope to display a stable calibration waveform.

P7350 5 GHz Differential Probe Instruction Manual

3

Getting Started

NOTE. If your instrument supports probe calibration routines, now is
a good time to perform them.

6. Disconnect the probe from the PROBE COMPENSATION

connector, and connect the two KlipChips together.

7. With the probe offset set to 0.0 V, the oscilloscope display should

be at the ground reference.

8. Set the oscilloscope volts/division to 500 mV.

9. Adjust the probe offset. The displayed waveform should vary

between approximately +1.25 V and --1.25 V.

Options

The following options are available when ordering the P7350 probe:

H Option D1--Calibration Data Report

H Option D3--Calibration Data Report, 3 years (with Option C3)

H Option C3--Calibration Service 3 years

H Option D5--Calibration Data Report, 5 years (with Option C5)

H Option C5--Calibration Service 5 years

H Option R3--Repair Service 3 years

H Option R5--Repair Service 5 years

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P7350 5 GHz Differential Probe Instruction Manual

Features and Standard Accessories

Table 1 shows the features and standard accessories of the P7350
differential probe.

Table 1: P7350 features and standard accessories

Feature/Accessory Description

TekConnect interface. The TekConnect interface provides a

communication path between the probe and the oscilloscope.
Contact pins provide power, signal, offset, and probe characteris­tic data transfer.

The probe snaps into the oscilloscope when fully engaged. To
remove, grasp the compensation box, press the latch button, and
pull the probe out.

Getting Started

Input connections. The plus and minus connections on the
probe tip accept the standard and optional probe accessories.

+

--

Ground

(Some of the accessories connect to the probe tip through the
square pin adapter.) The ground lead connects to the probe head
through a slot in the side of the insulated probe housing.

WARNING: Skin penetration hazard. To prevent injury, install the
probe tip cover when the probe is not in use. The probe tips are
extremely sharp to ensure good contact and measurement
integrity.

Probe tip cover. The probe tip cover is shipped on the probe.
The probe tips are extremely sharp to ensure good contact and
measurement integrity. When not using the probe, slide the probe
tip cover over the probe head to prevent damage to the probe tips
and to protect yourself from personal injury.

Tektronix part number: 200-4236-XX

Three-inch ground lead (2 ea). Use the ground lead for
connecting the probe ground to the circuit, if needed. The
socketed end of the lead may be connected to accessories, or
fitted onto 0.025-inch square pins.

Tektronix part number: 196-3469-XX (package of 2)

P7350 5 GHz Differential Probe Instruction Manual

5

Getting Started

Table 1: P7350 features and standard accessories (Cont.)

Feature/Accessory Description

Variable spacing adapter (4 ea). The variable spacing adapter

fits over the probe tip. Push the adapter onto the probe tip until it
seats against the probe head.

Use the variable spacing adapter to probe any two adjacent leads
or test points spaced between 0.020 and 0.180-inches apart. See
Figure 16 on page 28 for physical dimensions of the adapter.
Adjust the articulated pins by gently rotating them using a pair of
tweezers.

NOTE: The articulated pins can be bent, but they are fragile. Use
extreme care when bending the pins.

The elastomeric contacts inside the adapter are rated for 50--75

Seated
against

probe head

insertion cycles with the probe tip. Replace the adapter after
exceeding these limits to avoid unreliable operation.

Seated
against

probe head

Tektronix part number: 016-1885-XX (package of 4)

Square pin adapter (4 ea). Push the square pin adapter onto the
probe tip until it seats against the probe head. Use the square pin
adapter to connect the probe to other accessories, such as the
Y-lead adapter or TwinFoot adapter. The inputs on the adapter
are spaced 0.100 inches apart. See Figure 17 on page 28 for
physical dimensions of the adapter.

CAUTION: To avoid damaging the square pin connectors, do not
insert anything larger than a 0.025-inch square pin into the inputs.

The elastomeric contacts inside the adapter are rated for 50--75
insertion cycles with the probe tip. Replace the adapter after
exceeding these limits to avoid unreliable operation.

Tektronix part number: 016-1884-XX (package of 4)

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P7350 5 GHz Differential Probe Instruction Manual

Table 1: P7350 features and standard accessories (Cont.)

Feature/Accessory Description

TwinFoot adapter (4 ea). Use the TwinFoot adapter to probe two

adjacent leads on a surface-mount integrated circuit. The
TwinFoot adapter connects to the probe through the square pin
adapter. Flexible fingers adapt to a range of lead spacings. See
Figure 6 on page 13.

Tektronix part number: 016-1785-XX (package of 4)

Y-lead adapter (2 ea). The Y-lead adapter connects to the probe
through the square pin adapter. The socketed ends of the leads
may be connected to the probe tips and accessories, or fitted onto

0.025-inch square pins.

Getting Started

Tektronix part number: 196-3468-XX (package of 2)

Antistatic wrist strap. When using the probe, always work at an
antistatic work station and wear the antistatic wrist strap.

Tektronix part number: 006-3415-XX

X-lead adapter (2 ea). The X-lead adapter connects between
accessories fitted with 0.025-inch pins, such as the SMT KlipChip
and Micro KlipChip adapters.

You can use the X-lead adapter with the adapters below to make
connections between the probe tip and your circuit under test.
Be aware of the electrical effects of the added lead length of the
adapters, especially as circuit frequencies increase.

Tektronix part number: 196-3473-XX (package of 2)

SMT KlipChip adapter (2 ea). Use this accessory to probe the
leads on dual-in-line packages (DIP).

Tektronix part number: 206-0364-XX

P7350 5 GHz Differential Probe Instruction Manual

7

Getting Started

Table 1: P7350 features and standard accessories (Cont.)

Feature/Accessory Description

Cable marker bands

Cable marker bands (10 ea). Attach matching pairs of the
marker bands onto the cable at the head and compensation box
of each probe. The marker bands enable quick verification of
which probe is connected to which instrument channel.

Tektronix part number: 016-1886-XX (package of 10)

Plastic accessory box. Use the plastic box to store the probe
accessories when not in use.

Tektronix part number: 006-7164-XX

Instrument case. The instrument case protects the probe from
harsh environments and provides room for storing optional
accessories.

Tektronix part number: 016-1879-XX

Calibration certificate. A certificate of traceable calibration is
provided with every instrument shipped.

Accessory reorder sheet.

Use the accessory reorder sheet as a quick guide for ordering
accessories for your probe. The sheet provides photos and part
numbers for identifying your accessories.

Tektronix part number: 001-1362-XX

Instruction Manual. Provides instructions for operating and
maintaining the P7350 differential probe

Tektronix part number: 071-1238-XX

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P7350 5 GHz Differential Probe Instruction Manual