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.
rev060CT86
1-3
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