Heater Probe Control

TB-9-4920-454-35 Tester Exhaust Gas Temperature Howell Instruments Inc. Model BH112JB-( ) Manual
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TB 9-4920-454-35

(15) Adjust AMB TEMP (oF) control to 99.

(16) TEMP oC indicator will indicate between 347 and 355, and % RPM indicator

will indicate between 86.3 and 87.3.

(17) Adjust calibrator output to 24.91 mV dc less millivolt value equivalent to

ambient temperature obtained in table 3.

(18) Adjust oscillator for 1.0 V, 77 Hz (12.987 ms) output.

(19) Adjust AMB TEMP (oF) control to -1.

(20) TEMP oC indicator will indicate between 711 and 719, and % RPM indicator

will indicate between 116.5 and 117.5.

b. Adjustments

(1) Connect multimeter between TP4 (+) and TP3 (-) on tachometer circuit board

(fig. 6). If multimeter does not indicate between 7.840 and 7.880 V dc, adjust R67 (fig. 6) for

7.860 V dc (R).

(2) Adjust R59 (fig. 6) for 100.9% indication on % RPM indicator(R).

(3) Adjust R64 (fig. 6) for 111.2% indication on % RPM indicator (R).

(4) Adjust R63 (fig. 6) for 93.1% indication on % RPM indicator (R).

(5) Adjust R66 on temperature board (fig. 3) for 0 indication on TEMP oC indicator (R).

(6) Adjust R69 (fig. 3) for 800 indication on TEMP oC indicator (R).

12. Heater Probe Control

CAUTION

Never add cold probes to a tester that is regulating other

probes at an elevated temperature. To do so could cause

overheating of hot probes. Probe controller operates on an

average temperature.

NOTE

TIs will be calibrated with number of probes supplied with TI.

a. Performance Check

(1) Ensure that the equipment and cables which were connected during

performance of paragraph 11 are disconnected.

(2) Position controls as listed in (a) through (d) below:

(a) FUNCTION SELECT to HEATER PROBE.