TB 9-4920-364-24
Table 4. Potentiometer Range - Continued
Test instrument C dial indication
Calibrator
output (mV)1
Min
Initial
Max
24.902
599
600
601
20.640
499
500
501
16.395
399
400
401
12.207
299
300
301
8.137
199
200
201
4.095
99
100
101
1
Subtract millivolt value recorded in 8 a (6) above.
b. Adjustments
(1) Set SW-6 switch to MECH. ZERO.
(2) Connect equipment as shown in figure 1.
(3) Adjust C control for a 0 degree indication.
(4) Repeat a (6) above.
(5) Set SW-6 switch to RANGE.
(6) Adjust TRIMPOT B (fig. 2) until GALVO-1 indicates 0.
(7) Repeat b (1) above.
(8) Set calibrator to standby and reverse connections at calibrator input.
(9) Adjust C control to 1000 dial indication.
(10) Adjust output of calibrator to 41.269 mV, less millivolt value used in a (6) above.
(11) Repeat b (5) above.
(12) Adjust TRIMPOT A (fig. 2) until GALVO-1 indicates 0.
(13) Repeat (1) through (12) above until no further adjustments are required.
9. Resistance Check
a. Performance Check
(1) Connect TI INPUT RES. INSUL. P-2 to HIGH and LOW terminals of
resistance standard using resistance check adapter (BH-485 and BH823, p/o TI).
(2) Set SELECTOR SWITCH SW-1 to RES.
(3) Set SW-6 switch to MECH. ZERO.
(4) Adjust GALVO-1 MECH. ZERO for a 0 indication on GALVO-1.
(5) Adjust resistance standard for 4.21 ohms.
(6) Set RESISTANCE CHECK SW-3 switch to 4.21 ohms.
5 divisions,
(7) Set SW-6 switch to RANGE. If GALVO-1 does not indicate 0
perform b below.
(8) Set SW-6 switch to MECH. ZERO.
