TB 9-6625-2114-24
Figure 3. Adjustment locations - top view.
b. Adjustments
(1) Adjust R21 (fig. 3) fully ccw, then adjust approximately 20 degrees cw (only SN
0982A22438 and below) (R).
(2) Adjust ZERO ADJ (rear of TI) for 0 meter deflection (may not appear on TI
below SN 550).
(3) Adjust ZERO ADJ to return meter pointer halfway back to 0. For SN
0982A22439 and above, adjust R6 (fig. 3) until TI meter indicates 0 with FUNCTION
switch in both +DCV and -DCV positions.
(4) Set calibrator for a 15 mV output.
(5) Adjust R18 (fig. 3) for a 0.015 V indication on TI (R).
16. Ac Voltage
a. Performance Check
(1) Set TI controls as listed in (a) through (c) below:
(a) FUNCTION switch to ACV.
(b) RANGE switch to .5V.
(c) AC ZERO control to center of its rotation.
(2) Connect AC PROBE tip and ground clip lead together. If TI meter does not
indicate 0, perform b (1) and (2) below.
(3) Connect AC PROBE tip and ground clip lead to calibrator OUTPUT HI and LO.
(4) Adjust calibrator frequency for 400 Hz and output for a full-scale indication on
TI. If calibrator does not indicate between 0.4850 and 0.5150 V ac, perform b (3) and (4) below.
(5) Repeat technique of (4) above using settings and indications listed in table 7. If
calibrator does not indicate within limits specified, set calibrator to nominal value and
perform adjustments listed in table 7 for full-scale indication on TI.
