Figure 3. Temperature circuit board.

TB 9-4920-454-35

Table 4. Temperature Indicator Accuracy Check

Temperature instrument temperature

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 µs; if not, adjust R26 (fig. 3) for a 100 µs

indication on frequency counter (R).

R66

R65

R59

TP1

TP2

R26

TP3

R69

R57

Figure 3. Temperature circuit board.

(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

obtained in table 3, plus .017 mV.

(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.