HP 438A Service Manual

Errata
Title & Document Type: 438A Power Meter Operating and Service Manual
Manual Part Number: 00438-90028
Revision Date: 1986-04-01
HP References in this Manual
This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-
Packard's former test and measurement, semiconductor products and chemical analysis
businesses are now part of Agilent Technologies. We have made no changes to this
manual copy. The HP XXXX referred to in this document is now the Agilent XXXX.
For example, model number HP8648A is now model number Agilent 8648A.
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HP 438A Specifications

General

Brand	HP
Model	438A
Category	Measuring Instruments
Language	English

Summary

General Information

Specifications

Technical specifications and performance limits of the HP 438A Power Meter.

Safety Considerations

Important safety guidelines for using the instrument.

Description

Detailed explanation of the HP 438A Power Meter's features and functions.

Accessories Available

Information on optional accessories that can be used with the instrument.

Installation

Power Requirements

Specifies the power source and voltage requirements for operation.

Line Voltage and Fuse Selection

Guides on selecting the correct line voltage and fuse for the instrument.

Operation

Local Operation

Instructions for operating the instrument using its front panel controls.

Remote Operation HP-IB

Procedures for controlling the instrument via the HP-IB interface.

Filters

Explanation of the filtering functions to reduce jitter in measurements.

Error Messages

Lists and explains error messages displayed by the instrument.

Performance Tests

Instrument Accuracy Test

Procedure to verify the measurement accuracy of the instrument.

Zero Carryover Test

Test to check the zeroing stability of the instrument.

Adjustments

+15 Volt Power Supply Adjustment

Steps to adjust the +15V power supply output.

Power Reference Level Adjustment

Procedure to adjust the power reference oscillator output level.

Replaceable Parts

Replaceable Parts List

A comprehensive list of all replaceable parts for the instrument.

Illustrated Parts Breakdown

Diagrams showing the location of parts on the front and rear panels.

MANUAL CHANGES

Service

Troubleshooting Hints

General troubleshooting tips and guidance for diagnosing issues.

Service Related Error Messages

Specific error messages related to service and hardware issues.