Model 3455A
Section VIII
SECTION VIII
SERVICE
B-1.
INTRODUCTION.
8-2.
This section
contains theory of operation, trouble-
shooting procedures, safety considerations, and general
service infomation for the Model 34SSA 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.
WARNIN^
Any interruptiun
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. Tlic use of repaired fuses
and the short-circuiting
of fuse holders must be
avoided.
j«arnin£^
The service information
presented in this
manual is normally used with
the
protective
covers removed and power applied to the
instrument. I'nergy available
at many points
may,
if
contacted, result in personal infury.
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.
Figure
8-1.
Function Block Diagram.
8-1
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