TB 9-6625-2284-40
NOTE
Improper seating of NVD with alignment collar will result in
erroneous readings.
e. Connect the reference NVD detector standard to multimeter (fig. 2).
NOTE
If NVD detector standard is exposed to overload light
conditions, several minutes are needed in low light level
conditions for it to recover.
f. Performance Check
(1) Turn secondary reference NVD detector standard power ON/OFF switch to ON
and allow standard to warm-up for 2 minutes.
NOTE
(2) Zero multimeter indication.
(3) Verify that reference NVD detector standard noise level does not exceed 0.02
mV. (No adjustments can be made. Return reference standard to primary laboratory for
maintenance/repair.)
(4) Set auxiliary source HIGH LOW switch to HIGH.
(5) Set auxiliary source II, III, OFF switch to II, and allow the auxiliary source to
warm-up for 10 minutes.
(6) Momentarily de-energize auxiliary source, re-zero multimeter, as required, and
then reenergize auxiliary source.
(7) The multimeter indication shall be between 0.99 and 1.01 of the V (STD). If not,
adjust auxiliary source through the adjustment access hole (fig. 2) for in-tolerance reading.
Refer to calibration test report to obtain V (STD) value. If adjustment cannot be made,
return reference detector standard and auxiliary source to primary laboratory for
recertification.
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