1-5. An Explanation Of The On-Site Service Strategy; Hardware Features; Built-In Test Features; Firmware Features - HP 8642A Operation And Calibration Manual

Model 8642A/B
General Information
1-5. AN EXPLANATION OF THE ON-SITE SERVICE STRATEGY
The objectives of the on-site service strategy are to provide the equipment and information
necessary to enable service-trained personnel to troubleshoot and repair the lIP 8642A/B to the
module level at its operating site. Using the On -Site Service Kit (refer to paragraph 1-12 for a
description), a service person should be able to successfully repair 80% or more of Signal Genera-
tor failures within two hours after arriving at the operating site. Repair times may be longer for
individuals with no prior training or experience on the lIP 8642A/B.
The following service features have been designed into the HP 8642A/B:
Hardware Features
• Each major circuit function is physically located in a separate module.
• RF modules are arranged physically from left to right in the order of their functional
sequence.
• Most intermodule connections are accessible from the top of the instrument.
e There are no RF feedback paths between modules (a feed-forward design).
e Printed on the inside top cover of the instrument is an illustrated top view of the inside of
the instrument as well as a table of cable connections.
Built-In Test Features
• A voltmeter and a power meter are built into the instrument.
• Unique service tools are stored inside the HP 8642A/B cabinet.
Firmware Features
• All RF modules are connected to a diagnostic bus which allows the controller to monitor
critical operating test points within the module.
• Critical message information concerning the operating condition of the HP 8642A/B is
displayed in numeric code on the front panel (or can be printed via an HP-IB printer with-
out the need of an external controller).
• Four instrument diagnostic levels help to analyze the instrument's condition: Power-Up
Self -Check, Fault Detection Self -Check, Instrument Level Diagnostics, and Module Level
Diagnostics.
1-7.
HOW THE OPERATING FUNDAMENTALS CAN HELP YOU LEARN TO OPERATE
THE INSTRUMENT
The Operating Fundamentals are abbreviated, front-panel operating instructions (included with
Volume I as a separate booklet) which will enable you to operate the basic functions of the Signal
Generator without using the more detailed and extensive portions of the Operating Manual.
However, the Detailed Opera ting Instructions in Section III can provide more specific inf orma-
tion, which can be easily accessed with an Index.
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