TM 11-6625-444-14-2
Section V. PERFORMANCE ASSURANCE TESTS
6-13. General
RMT
out
RATIO FULL RANGE
Mid-position
This section contains performance assurance
GUARD
NORM (Out)
checks that compare the voltmeter with the ap-
plicable performance specifications. These are
FRONT (Out)
INPUT
"in-cabinet" checks that should be made in the
AC NULL
Mid-position
sequence outlined and before any attempt is
made to calibrate the voltmeter. The perfor-
DC ZERO
Mid-position
mance assurance tests should also be used as
part of the troubleshooting procedure and before
b. Dc Volts Accuracy Checks
returning the instrument to regular service after
All
repair, recalibration or extended storage.
(1) Connect shorting straps between the
checks are to be conducted in a clean,
Hl, LO and GUARD INPUT terminals.
draft-free environment having an ambient tem-
perature of 73F 4F and a relative humidity
less than 70%. Required test equipment is listed
(2) Adjust the front panel DC ZERO con-
in table 6-1.
trol for a digital readout of 0.00000 .00001.
Set the exact DC ZERO by noting the tripping
point of the - polarity indicator to + polarity.
(3) Remove the shorting strap from the HI
a. Preliminary Set-up. Connect the voltmeter
and LO INPUT terminals.
to ac line power and set the controls as follows:
ON (Pushed in)
POWER OFF/ON
(4) Connect the dc voltage calibrator to
the INPUT terminals, observing polarity.
See
Approx. 1 reading/
SAMPLE RATE
sec
VOLTS DC
FUNCTION
(5) Apply each of the voltages shown in
RANGE
2
digital display shall indicate as specified.
AUTO
Out (Manual)
