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TM 55-6695-220-13&P
l.
Rotate the TEMPERATURE SELECTOR SWITCH to the 700º or 900°C location on the green dial sector,
depending upon instructions contained in Table 2-2. Turn the RESISTANCE AND VOLTAGE FUNCTION SWITCH to
the AIRPLANE TEST, zero ohm position. Adjust first the COARSE and second the FINE RHEOSTATS until the
VOLTMETER pointer rests exactly over the red line. Step the TEMPERATURE SELECTOR SWITCH over the entire
green sector and note the readings on the test indicator. With the reference temperature compensator located in the
indicator working properly the indicator readings should equal the dial temperature plus the ambient temperature
registered on the tester's liquid-filled glass thermometer. The indicator's errors are the differences between these two
sets of readings.
2-2.
THERMOCOUPLE LEAD RESISTANCE TEST PROCEDURES.
2-2
The lead resistance becomes one leg of a null-balance bridge. Thus the tester's clip
leads should be attached first to the thermocouple leads with the indicator removed
before the RESISTANCE AND VOLTAGE FUNCTION SWITCH is rotated to the LEAD
RESISTANCE position. This procedure prevents unnecessary striking of the
VOLTMETER pointer against the stops.
2-7
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