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Page Title:
Table 6-1. Troubleshooting-Continued |
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 TM 11-6625 -537-14-1
Table 6-1. TroubleshootingContinued
Corrective action
Probable cause
Malfunction
a. Check and replace faulty resistor.
32. REF CAL ADJ R318 cannot be
sampling string R316 through
adjusted to null VOLTS meter.
R319.
b. Faulty standard cell R1
b. Check standard cell for between
1.0190 and 1.0196 volts. Replace
if voltage is out of tolerance.
CAUTION
Use only a null type
meter to avoid damaging
the standard cell. The
standard cell is isolated
from all internal circuits
by the OPERATE-
CALIBRATE switch,
The plug to the standard
cell should be removed
before performing any
voltage or resistance
measurements on the
OPERATE-CALI-
BRATE switch to pre.
vent accidental shorting
and damage to the cell,
NOTE
Normal- service life of the
standard cell is 8 to 15
years. End of service life
is usually marked by an
increase in temperature
hysteresis effect. That is,
reading errors in excess
of 0.025 percent will
result when the same
voltage is read when the
differential voltmeter is
cold and at normal
operating temperature
6-6
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