12
E1412A 6 1/2 Digit Multimeter Service Guide
General Information
Safety Considerations
Warnings and Cautions
This section contains WARNINGS which must be followed for your protection and
CAUTIONS which must be followed to avoid damage to the equipment when
performing instrument maintenance or repair.
SERVICE
-
TRAINED PERSONNEL ONLY
.
The information
in this manual is for service
-
trained personnel who are
familiar with electronic circuitry and are aware of the hazards
involved. To avoid personal injury or damage to the
instrument, do not perform procedures in this manual or do
any servicing unless you are qualified to do so
.
CHECK MAINFRAME POWER SETTINGS
.
Before applying
power
,
verify that the mainframe setting matches the line
voltage and that the correct fuse is installed
.
An
uninterruptible safety earth ground must be provided from
the main power source to the mainframe input wiring
terminals
,
power cord
,
or supplied power cord set
.
GROUNDING REQUIREMENTS
.
Interruption of the
protective (grounding) conductor (inside or outside the
mainframe) or disconnecting the protective earth terminal
will cause a potential shock hazard that could result in
personal injury. (Grounding one conductor of a
two-conductor outlet is not sufficient protection
.
)
IMPAIRED PROTECTION
.
Whenever it is likely that
instrument protection has been impaired, the mainframe
must be made inoperative and be secured against any
unintended operation.
USING AUTOTRANSFORMERS
.
If the mainframe is to be
energized via an autotransformer (for voltage reduction)
make sure the common terminal is connected to neutral
(that is
,
the grounded side of the main’s supply).
CAPACITOR VOLTAGES
.
Capacitors inside the mainframe
may remain charged even when the mainframe has been
disconnected from its source of supply
.
USE PROPER FUSES
.
For continued protection against
fire hazard
,
replace the line fuses only with fuses of the
same current rating and type (such as normal blow
,
time
delay
,
etc
.
). Do not use repaired fuses or short
-
circuited
fuseholders
.
Summary of Contents for E1412A
Page 1: ...Keysight E1412A 6 1 2 Digit Multimeter Service Manual 75000 Series C ...
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Page 6: ...vi ...
Page 12: ...xii Keysight E1412A 6 1 2 Digit Multimeter Service Guide ...
Page 74: ...68 Keysight E1412A 6 1 2 Digit Multimeter Service Guide Adjustments CALibration ...
Page 80: ...74 E1412A 6 1 2 Digit Multimeter Service Guide Backdating ...
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