TB 9-6625-2284-50
d. Firmly seat secondary reference NVD detector standard (blue anodized) into the
NVD alignment collar, rotating in a clockwise direction until the scribe lines on the
reference detector standard are in alignment with the auxiliary source scribe lines (fig.
NOTE
Improper seating of NVD with alignment collar will result in
erroneous readings.
e. Connect the
reference NVD
detector standard to digital 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
Digital multimeter must not be in autoranging position.
(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.
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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