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Chapter 6 Backdating

Introduction

6-2 Assembly-Level Service Guide

Introduction

This chapter contains information necessary to adapt this guide to apply

to older instruments.

The backdating information includes the following:

Manual Changes

This guide applies directly to Counters with the following serial prefixes

listed in Table 6-1.

As engineering changes are made, newer instruments may have higher

serial prefix numbers than the one shown on the title page of this guide.

The guides for these instruments will be supplied with “Manual Updating

Changes” package containing the required information. Replace the

affected pages or modify existing guide information as directed in the

pages of the Manual Updating Changes package. Contact the nearest

Hewlett-Packard Sales and Support Office.

Older Instruments

To adapt this guide to older HP 53131A/132A/181A Counters having a

serial prefix lower than 3711, perform the backdating provided in the

following sections.

• Backdating Hardware page 6-3

• Backdating Firmware page 6-8

• Backdating Specifications page 6-16

Table 6-1. Instrument this Guide Directly Applies To

Instrument Serial Prefix Number

HP 53131A Universal Counter 3711

HP 53132A Universal Counter 3710

HP 53181A Frequency Counter 3711

1 2 ... 197 198 199 200 201 202 203 204 205 206 207 ... 253 254

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