Table of Contents
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Model 3455A
Section VIII
SECTION
VIII
SERVICE
8-1. INTRODUCTION.
8-2. This section contains theory of operation, trouble-
shooting procedures,
safety considerations, and general
service
information
for the Model
3455A
Digital Volt-
meter.
8-3. SAFETY CONSIDERATIONS.
8-4. Although this instrument has been designed in accor-
dance
with
international
safety
standards,
this manual
contains information, cautions, and warnings which must
be followed to ensure safe operation and to maintain the
instrument in safe operating condition. Service and adjust-
ments
should
be performed
only by qualified
service
personnel.
8-5. Any
adjustment,
maintenance,
and
repair
of the
opened instrument while any power or voltage is applied
should be avoided
as much
as possible, and, when inevit-
able, should be carried out only by a skilled person who is
aware of the hazard involved.
Any
interruption
of the protective grounding
conductor {inside or outside the instrument} or
disconnection
of the protective earth
terminal
is likely
to
make
the
instrument
dangerous.
Intentional
interruption
of
the
protective
grounding conductor is strictly prohibited.
8-6. It is possible for capacitors inside the instrument to
still be charged even if the instrument has been discon-
connected from its power sources.
8-7. Be certain that only fuses with the required current
rating and of the specified typed (normal blow, time delay,
etc.) are used for replacement. The use of repaired fuses
and the short-circuiting of fuse holders must be avoided.
The
service
information
presented
in
this
manual
is normally
used
with
the protective
covers
removed
and
power
applied
to
the
instrument.
Energy
available
at
many
points
may, if contacted, result in personal injury.
8-8. RECOMMENDED TEST EQUIPMENT.
8-9. Test equipment required to maintain the Digital Volt-
meter is listed in Table
1-3. Equipment other than that
listed may be used if it meets the listed critical specifica-
tions.
1
'
i
'
|
1
|
INPUT 1
mn o—t
INPUT SWITCHING
ATTENUATOR
AUTO CALIGRATION
easumewent .
Santen
InGUBRD
CONTROLLER
Figure 8-1. Function Block Diagram.
8-1
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Table of Contents
Troubleshooting
