Keysight 1143A Manual

User and

Service Guide

Publication number 01143-97000

First edition, June 2000

1143A

Probe Offset Control

and Power Module

1143A Probe Offset Control

and Power Module

The 1143A Probe Offset Control and Power Module is an alternate

control and power source for active probes. When an active probe

cannot be powered from a connector at the front of the oscilloscope,

the module is used to provide power, local offset control, and a

remote offset interface. Following below are its main features. See

chapter 2 for full characteristics.

•Power and control for two probes

•+17.3 Vdc and −17.3 Vdc at 300 mA each

•Offset current source of ±5 mA for each probe

•Remote input for offset control

Accessories Supplied

The following accessories are supplied.

•Power cable

•User and Service Guide

Accessories Available

The following accessories can be ordered.

•01143-61602, 1.5-meter (59-inch) probe power extension cable

(Order with the module as Option 001.)

Options Available

The following options are available.

•Option 001, 1.5-meter (59-inch) probe power extension cable

•Option 0B1, Additional User and Service Guide

Service Strategy

The service strategy for the 1143A Probe Offset Control and Power

Module is for field repair to the component level. See chapter 2,

"Service," for further information.

In This Book

This book provides use and service documentation for the 1143A Probe

Offset Control and Power Module. It is divided into two chapters.

Chapter 1 shows you how to set up and operate the instrument, both locally

and remote.

Chapter 2 provides service information. Included is how to test the supply

performance, how and when to make adjustments, and how to troubleshoot

and repair the instrument.

Contents

1 Operating the Power Module

To inspect the power module 9

To check power requirements 11

To set the line voltage selection 11

To set up the power module 12

To use local offset 13

Remote Offset Input 14

2Service

General Information 20

Performance Characteristics 20

Operating Characteristics 20

General Characteristics 21

Recommended Test Equipment 23

Service Strategy 23

To clean the instrument 23

To return the instrument to HP for service 24

Testing Performance 25

Test Interval 25

Equipment Required 25

To test output voltages 26

Making Adjustments 27

Safety 27

Adjustment Interval 27

Equipment Required 27

To prepare the equipment 29

To adjust power supply voltages 29

To adjust power supply current limits 30

To adjust offset zero 31

Troubleshooting and Repair 32

To troubleshoot the power supplies 32

To troubleshoot the offset circuitry 33

To disassemble the instrument 34

Replaceable Parts 35

Theory of Operation 44

Schematic Diagrams 47

Index 53

Contents

To inspect the power module 9

To check power requirements 11

To set the line voltage selection 11

To set up the power module 12

To use local offset 13

Remote Offset Input 14

Operating the

Power Module

Introduction

This chapter shows you how to connect and operate the 1143A Probe

Offset Control and Power Module. The following information is

covered in this chapter:

•Initial Inspection

•Power Requirements

•Line Voltage Selection

•Setting up the supply

•Using Local Offset

•Remote Offset

For additional information, read the user and service guide for the

active probe being used with the module.

To inspect the power module

Inspect the shipping container for damage.

Keep a damaged shipping container or cushioning material until the contents

of the shipment have been checked for completeness and the instrument has

been checked mechanically and electrically.

Check the accessories.

Accessories supplied are listed in the introduction of this manual, page 2.

•If the contents are incomplete or damaged notify your Agilent

Technologies sales office.

Inspect the instrument.

•If there is mechanical damage or defect, or if the instrument does not

operate properly or pass performance tests, notify your Agilent

Technologies sales office.

•If the shipping container is damaged, or the cushioning materials show

signs of stress, notify the carrier as well as your Agilent Technologies sales

office. Keep the shipping materials for the carrier’s inspection. The

Agilent Technologies office will arrange for repair or replacement at

Agilent Technologies’ option without waiting for claim settlement.

Figure 1

1143A Probe Offset Control and Power Module FrontPanel

Figure 2

1143A Probe Offset Control and Power Module Rear Panel

Operatingthe Power Module

To inspect the power module

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