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  TM 55-4920-244-14
NOTE
harness to be tested. Place probes properly on
thermocouples.
A spacer of the same
d. Connect check cable to tester at
thickness as the wall of
CHECK CABLE connector and to thermocouple
the exhaust duct and the
harness. Use check cable adapter if necessary.
mounting
thermocouple
e. Place switch SW-1 in T/C position and
boss is required to prop-
switch SW-2 in S-1 position.
erly position the probe on
f. Place switch SW-6 in MECH. ZERO
the thermocouple.
position and zero galvanometers by turning
Replace engine thermocouples not within
MECH. ZERO knob.
specified manufacturer's tolerance.
g. Place switch SW-6 in RANGE position
and adjust TEMP. REGULATOR until heater
probes reach test temperature.
2-9).
h. With heater probes stabilized at test
a. Remove thermocouple harness to be
temperature, place SW-2 in S-2 position and read
bench checked and place in suitable jig.
output of thermocouples.
b. Prepare tester for operation per para-
i. The difference between the test temper-
through d.
ature and the thermocouple output is the ther-
c. Connect the same number of heater
mocouple error and should not exceed system
probes to the junction box as thermocouples in
tolerance.
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