TB 9-4931-393-24
9. Thermistor Resistance
a. Performance Check
(1) Set FUNCTION switch to LINE OFF.
(2) Disconnect TI from autotransformer.
100Ω
(3) Set MOUNT RESISTANCE
THERMISTOR
switch
to
and
RESISTANCE (PERCENT) switch to -.5.
(4) Connect multimeter between pins 1 and 2 of TI RESISTANCE STANDARD connector.
(5) Measure resistance. Multimeter will indicate between 99.44 and 99.56 ohms.
(6) Repeat technique of (5) above, using settings and indications listed in table 4.
Table 4. Thermistor Resistance
Test instrument
THERMISTOR
Multimeter indications (ohms)
RESISTANCE
(PERCENT) switch
Min
Max
settings
-0.4
99.54
99.66
-0.3
99.64
99.76
-0.2
99.74
99.86
-0.1
99.84
99.96
0
99.94
100.06
+0.1
100.04
100.16
+0.2
100.14
100.26
+0.3
100.24
100.36
+0.4
100.34
100.46
+0.5
100.44
100.56
01
199.88
200.12
MOUNT RESISTANCE switch to 200 Ω.
1Set
b. Adjustments. No adjustments can be made.
10. Power Supply
a. Performance Check
NOTE
Do not perform power supply check if all other parameters are
within tolerance.
(1) Set FUNCTION switch to CURRENT OFF.
(2) Connect multimeter across capacitor A1C5 (fig. 1 or 2). If multimeter does not
indicate between -29.95 and -30.05 Vdc, perform b (1) below.
(3) For TIs with serial numbers prefixed 610 or 613, connect multimeter between
739 or 811A, connect multimeter between negative side of A1C5 (fig. 2) and base of