TB 9-6625-2185-35
Table 9. Dc
Accuracy (Ranges 4, 5,
and 6)
Calibrator
Press
output
Allow
Wait 30 seconds
pushbuttons
(V dc)
settling
and press 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 TP7 and TP8 (fig. 1) to chassis ground.
(4) Connect digital multimeter to TP9 and chassis ground (fig. 1). If digital
multimeter does not indicate between +10 and -10 mV, adjust R45 (fig. 1) for a 0 V
indication (R).
(5) Remove connection from TP8 and chassis ground. If digital multimeter does
not indicate between +10 and -10 mV, adjust R36 (fig. 1) for a 0 V indication (R).
not indicate 0 +100 mV, adjust R4 CHOPPER ADJ and R5 CHOPPER ADJ (fig. 1)
equally but in opposite direction to obtain as close to 0 V indication as possible.
NOTE
Due to considerable fluctuation in digital multimeter
indication above, use averaging to determine values.
(7) Disconnect digital multimeter from TI. Press ZERO pushbutton and wait for
zeroing to end.
(8) Press 5 and RANGE HOLD pushbuttons.
(10) Set calibrator for 0.9 V dc output. If TI display does not indicate 3685, adjust
(11) Set calibrator for 0.09 V dc output. If display does not indicate 368 or 369,
adjust R11 (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 R1 and R11 (fig. 1) near center.
(14) Set calibrator for 0.9 V dc output.