TB 9-6625-1942-24
b. Adjustments
(1) Connect multimeter between A1A1TPA (fig. 1) and INPUT LOW terminal.
(2) Turn SAMPLE RATE control fully ccw to HOLD position.
150
V dc indication on
(3) Adjust A1A1R210 INT ZERO ADJ (fig. 1) for a 0
(4) Set FUNCTION switch to DC, RANGE switch to 10V, and SAMPLE RATE
control to FAST.
(5) Connect calibrator to TI INPUT terminals and adjust calibrator output for +1.0
mV dc.
(6) Adjust A1A1R225 DETECT LEVEL (fig. 1) for a maximum reading on TI
display. Note reading.
(7) Reverse polarity of TI input and adjust A1A1R228 TURNOVER (fig. 1) for
reading noted in (6) above. Continue reversing input polarity and adjusting A1A1R228
TURNOVER until both positive and negative readings are equal (R).
(8) With 1.0 mV dc applied to TI, adjust A1A1R225 DETECT LEVEL (fig. 1) for a TI
display of + 00.0010 (R).
(9) Connect calibrator in reverse polarity to TI INPUT. Adjust calibrator output for
a +10 V dc.
(10) Adjust A1A1R311 +REF (fig. 1) for a +10.0000 V indication on TI (R).
(11) Set FUNCTION switch to TEST and RANGE switch to 3.
(12) Adjust A1A1R317 -REF (fig. 1) for equal plus and minus indications (0.99995 1
count). The last digit must be between 2 and 9 (R).
(13) Set FUNCTION switch to DC, RANGE switch to 10V, and repeat (9) through
(12) above until tolerances listed in (10) and (12) above are met.
(14) Adjust A2R15 1V ADJUST (fig. 1) for a 1.00000 V indication on TI (R).
(15) Adjust A2R3 100 V ADJUST (fig. 1) for a 100.000 V indication on TI (R).
(16) A2R16 0.1V ADJUST (fig. 1) for a -1000.00 indication on TI (plus or minus offset
noted in 8 a (17) above) (R).
a. Performance Check
(1) Connect TI to calibrator.
(2) Set TI FUNCTION switch to AC and RANGE switch to 1V.
(3) Set calibrator output to 1 V ac at 50 kHz. If TI indication is not between 0.99870
and 1.00130 V ac, perform b (1) below.
(4) Set calibrator output frequency to 100 Hz.
If TI indication is not between
0.99870 and 1.00130 V ac, perform b (2) below.