Section V. PERFORMANCE ASSURANCE TESTS
RATIO FULL RANGE
This section contains performance assurance
checks that compare the voltmeter with the ap-
plicable performance specifications. These are
"in-cabinet" checks that should be made in the
sequence outlined and before any attempt is
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
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-
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.
6-14. Performance Testing
(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)
(4) Connect the dc voltage calibrator to
the INPUT terminals, observing polarity.
Approx. 1 reading/
(5) Apply each of the voltages shown in
to the voltmeter
digital display shall indicate as specified.