Agilent Technologies 1141A Manual

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User and Service Guide

Publication number 01141-97002

July 2004

For Safety and Regulatory information, see the pages at the end

of this book.

Agilent Technologies 1141A

Differential Probe and 1142A

Probe Control and Power

Module

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Agilent Technologies 1141A Differential Probe and

1142A Probe Control and Power Module

This manual contains information for use and service of the differential

probe system, the 1141A Differential Probe and 1142A Probe Control

and Power Module. In this document, the two models will be treated as

a system.

Each of the two instrument models that make up the differential probe

system has a serial number sticker. The sticker for the 1141A

Differential Probe is inside the probe, in the bottom cover. (See

chapter 3 for disassembly procedure.)

The 1141A/1142A probe system allows measurement of small

differential signals in the presence of much larger common-mode

signals. It has the following major features:

• 200 MHz bandwidth

• Variable offset

• dc reject

• ac coupling

• Remote operating capability

The variable offset capability can be used to measure small ac signals in

the presence of much larger dc levels. Remote operation of key

features allows the use of the probe system in automatic test situations.

The probe can be used with an oscilloscope, spectrum analyzer, or any

instrument where differential probing is required and a compatible

50 Ωinput is available.

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Contents

1 Operating the Probe

Accessories Supplied 6

Accessories Available 8

To inspect the probe 9

Using the probe with other instruments 9

Recommended Test Equipment 9

2 Calibration Tests and Adjustment

Equipment Required 26

The Test Board 26

Calibration Tests 27

dc Gain Accuracy 28

Bandwidth 34

CMRR Test 36

Calibration Test Record 39

Adjustments 40

Probe Adjustment 40

Adjustment Procedure 42

Attenuator Adapter Adjustment 49

3Service

Introduction 54

Performance Specifications and Characteristics 55

General Characteristics 58

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Contents

Theory of Operation 59

Differential Probe 60

Control and Power Module 60

Attenuator Adapters 61

Test Board 62

Service Policy 63

Troubleshooting 64

Probe Troubleshooting 64

Probe Control and Power Module Troubleshooting 64

Removing and Replacing Assemblies 66

Differential Probe 66

Probe Adapters 68

Probe Control and Power Module 70

Replaceable Parts 71

Parts List 71

Ordering Information 71

Direct Mail Order System 71

Manufacturers’ Codes 72

Exploded View 73

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Operating the Probe

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Operating the Probe

Accessories Supplied

Introduction

This chapter shows you how to connect and operate the 1141A

Differential Probe and 1142A Probe Control and Power Module as a

differential probe system.

Accessories Supplied

The following items are supplied as part of the 1141A/1142A probe

system. Item numbers refer to the numbers in Figure 1-1 on page -7

and Figure 1-2 on page -8. Those without item numbers are supplied

but not shown in figures. See the Replaceable Parts List for parts not

listed below.

Item Description Qty Part Number

1 Differential Probe 1

2 10x Attenuator Adapter 1 5063-2144

3 100x Attenuator 1 5063-2145

4 ac Coupling Adapter 1 5063-2146

5 Two-inch Extension Leads (package 5) 1 5959-9334

6 Mini Grabbers 2 1400-1422

7 Five-inch Ground Lead 1 5061-6162

8 Shielded Signal Lead 1 01141-68702

9 Test Board 1 01141-66504

10 Flat-blade Alignment Tool 1 8710-1961

11 Circuit Connection Posts (strip of 20) 1 1251-5943

Probe Control and Power Module 1 1142A

Power Cord 1 see parts list

Carrying case

User and Service Manual 1

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Operating the Probe

Accessories Supplied

Figure 1-1

1141A Differential Probe and Accessories

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Operating the Probe

Accessories Available

Figure 1-2

1141A Miscellaneous Accessories

Figure 1-3

1142A Probe Control and Power Module

Accessories Available

The following accessories can be ordered.

• 5959-9335 Long Extension Lead (5.5 inch/14 cm), package of 5

• 5090-4833 Mini grabber for SMT, package of 20

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Operating the Probe

To inspect the probe

Inspect the shipping container for damage. If the shipping container or cushioning

material is damaged, it should be kept until the contents of the shipment have been

checked for completeness and the instrument had been checked mechanically and

electrically. Accessories supplied with the instrument are listed in see “Accessories

Supplied” on page 6 of this manual.

If the contents are incomplete, if there is mechanical damage or defect, or if the

instrument does not pass calibration tests, notify the nearest Agilent Technologies office.

If the shipping container is damaged, or the cushioning materials show sign of stress,

notify the carrier as well as the nearest Agilent Technologies office. Keep the shipping

materials for the carrier’s inspection. The office will arrange for repair or replacement

at Agilent Technologies’ option without waiting for a claim settlement.

Using the probe with other instruments

The 1141A/1142A probe system can be used with other instruments as well as

oscilloscopes. You can use it with a spectrum analyzer or frequency counter, or any

instrument with an input that can be terminated with 50 Ω.

If you are going to use the probe system with an instrument other than an oscilloscope,

you may need to set up the probe with an oscilloscope first. This will allow you to select

coupling and reject modes, and set offset, so the output of the probe is compatible with

signal requirements of the other instrument.

Recommended Test Equipment

The following table is a list of the test equipment required to test calibration, make

adjustments, and troubleshoot this instrument. The table indicates the critical

specifications of the test equipment and for which procedure the equipment is necessary.

Equipment other than the recommended model may be used if it satisfies the critical

specifications listed in the table.

Recommended Test Equipment

Equipment Required Critical Specifications

Recommended

Agilent

Model/Part Use

Signal Generator 1 to 200 MHz, 400 m Vrms 8648A P

Function Generator 2.5 to 500 kHz, 600 m Vp-p to 16 Vp-p 33120A A

Oscilloscope >400 MHz bandwidth, 1 mV/div sensitivity 54830B P,A

dc source ± 100 mV to 7 Vdc E3632A P

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