Calibrator Board

TB 9-4920-454-35

(6) Adjust R59 (fig. 3) for TEMP oC indicator reading of 1397 (R).

(7) Repeat a (l) and a (3) through (8) above, as necessary, to ensure TEMP oC

indicator is in tolerance at both points.

NOTE

Perform paragraph 9 below only if adjustments were made in 8 b

above.

9. Calibrator Board

a. Performance Check

(1) Place thermometer adjacent to calibrator OUTPUT terminals. Wait 10 minutes

for thermometer to stabilize and record ambient temperature.

NOTE

Throughout this procedure it will be necessary to frequently

check the ambient temperature to assure proper millivolt

values in table 3 are applied.

(2) Remove jumper from test point TP2 (fig. 4) on calibrator circuit board.

TP4

TP2

SIG

TP3

R10

GND

Figure 4. Calibrator circuit board test and adjustment points.

(3) Disconnect Jl4 from Pl4 (located on left side of circuit board cage).

(4) Connect calibrator OUTPUT positive to the negative connectors of J14 and

OUTPUT negative to the positive connectors of J14. Connect multimeter to TP2 (+) and

TP4 on calibrator circuit board (fig. 4).