TB 9-6625-2185-24
Table 9. Dc Accuracy (Ranges 4, 5, and 6)
Calibrator
output
Allow
Wait 30 seconds
Press
(V dc)
settling
and press pushbuttons
pushbuttons
4, RANGE HOLD
0.09
---
CAL, REF LVL DB
5, RANGE HOLD
0.90
---
CAL, REF LVL DB
6, RANGE HOLD
4.5
---
CAL, REF LVL DB
b. Adjustments
(1) Set calibrator to 0 mV dc and OPR.
(2) Press 1, SELECT CHNL, 0 and RANGE HOLD pushbuttons.
(3) Connect A6TP7 and A6TP8 (fig. 1) to chassis ground.
(4) Connect multimeter to A6TP9 and chassis ground (fig. 1). If multimeter does
not indicate between +10 and -10 mV, adjust A6R45 (fig. 1) for a 0 V indication. (R)
(5) Remove connection from A6TP8 and chassis ground. If multimeter does not
indicate between +10 and -10 mV, adjust A6R36 (fig. 1) for a 0 V indication. (R)
(6) Remove connection from A6TP7 and chassis ground. If multimeter does not
indicate 0 +100 mV, adjust A6R4 and A6R5 (fig. 1) equally but in opposite direction to
obtain as close to 0 V indication as possible.
NOTE
Due to considerable fluctuation in multimeter indication above,
use averaging to determine values.
(7) Disconnect multimeter from TI. Press ZERO pushbutton and wait for zeroing
to end.
(8) Press 5 and RANGE HOLD pushbuttons.
(9) Connect equipment as shown in figure 5.
(10) Set calibrator for 0.9 V dc output. If TI display does not indicate 3685, adjust
A6R1 (fig. 1) for indication of 3685. (R)
(11) Set calibrator for 0.09 V dc output. If display does not indicate 368 or 369,
adjust A6R11 (fig. 1) for indication of 368. (R)
(12) Repeat (10) and (11) above until no further adjustments are needed.
NOTE
Perform (13) through (16) only if (10) or (11) are unsatisfactory
after adjustments.
(13) Adjust A6R1 and A6R11 (fig. 1) near center.
(14) Set calibrator for 0.9 V dc output.
CHANGE 1 19
