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
2

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.
3

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.
4

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
5

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
6

1
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
7

8

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.
9

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
10