TB 9-4931-217-40
28. Null Detector (Range Accuracy)
a. Performance Check
(1) Connect lead between TI DETECTOR INPUT terminals 1 and 2.
(2) Rotate DETECTOR SENSITIVITY control fully ccw to CALIBRATED
position.
(3) Set DETECTOR RANGE switch to 3 MICROVOLTS.
NOTE
When TI meter fluctuations are visible, determine average
value for fluctuations and consider this value to be meter
indication.
(4) Adjust DETECTOR ZERO control for a 0 (zero) indication on TI meter.
(5) Set DETECTOR RANGE switch to 1000 indicate 0 (zero) or less than one
minor division on upper scale, perform b (1) below.
NOTE
When switching transients are visible (abrupt changes in
meter indications), allow indications to stabilize before
obtaining final indication.
(6) Connect equipment as shown in figure 4.
(7) Turn voltage divider dials to .0010000.
(8) Adjust calibrator output controls to 0 (zero) and set TI POWER switch to ON.
(9) Set DETECTOR RANGE switch to 3 MICROVOLTS.
Figure 4. Dc detector voltage range calibration - equipment setup.