Section Vlli; Introduction; Safety Considerations - HP 3457A Service Manual
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- Operating instructions manual (363 pages) ,
- Service manual (6 pages) ,
- Service manual (273 pages)
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SECTION Vlll
SERVICE
8-1. INTRODUCTION
8-2. This section contains information t o aid in troubleshooting and repair of the HP
3457A
Digital
Multimeter. Included are safety considerations, theory of operation and troubleshooting procedures.
The information contained in this section is intended for tht7 use o f service trained
personnel
who ~rndcrsland cleclronic circuitry and are awarr o f thc hazards invol-
ved. Do not atfempl to perform any o f the procedwes outlined in this section ~rnltw
yo11 are qiralificd to do so.
8-3.
SAFETY CONSIDERATIONS
8-4. T h e HP 3457A is designed t o meet international safety standards. T o maintain these standards, the cau-
tions, warnings, and other safety related information contained in this manual must be followed. Servicing
of this instrument must be performed by service trained personnel.
Any interruption of thc protecfivc groirnding condlrctor (cithcr inside or outside thc
insfrrrmenf) or disconnection of the protrclive earlh terminal will likely make /he in-
strlrmcnt dangerolrs. Intrntional interruption o f the protective grolrnding conductor
is srriclly prohibiled.
The service information contained in this section normally requires removal o f the
protective covers and applicalion o f power. Voltugc~s or signals at many poinls
within the instr~rment may, i f contacted, restrli in personal injirry.
8-5. T o protect personnel and prevent damage t o the instrument, adjustment or repair with covers removed
and power applied must be avoided as much as possible. When it becomes necessary t o service the instru-
ment under these conditions, the work must be performed by
a
skilled person who is aware of the hazards
involved.
8-6. Be aware that it is possible f o r capacitors inside the instrument t o remain charged when the instrument
is turned off o r when the power source has been disconnected.
8-7. Be certain that only the recommended fuse type (fast blow, correct current rating, etc.) is used f o r
replacement. The use of repaired fuses o r short circuiting the fuse holder is prohibited.
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