TB 9-4920-454-35
Table 4. Temperature Indicator Accuracy Check
Temperature instrument temperature
oC
Calibrator
Min
Max
mV dc output
398
402
16.40
598
602
24.91
798
802
33.30
998
1002
41.31
1198
1202
48.89
1395
1399
55.82
b. Adjustments
(1) Connect frequency counter between TP3 (+) and TP2 (-) (fig. 3). Frequency
counter will indicate between 97.0 and 103.0 s; if not, adjust R26 (fig. 3) for a 100 s
R66
R65
R59
TP1
TP2
R26
TP3
R69
R57
(2) Connect multimeter between TP1 (+) and TP2 (-) (fig. 3). If multimeter does not
indicate between 7.255 and 7.295 mV dc, adjust R65 (fig. 3) for an indication of 7.275 mV dc.
(3) Adjust calibrator for a dc millivolt output equal to ambient temperature
(4) If TEMP oC indicator does not indicate 0, adjust R57 (fig. 3) for an indication of 0 (R).
(5) Adjust calibrator for a 55.820 mV dc, less millivolt equivalent to ambient
temperature, output.
7