2312G INSTRUCTION MANUAL
56-101-00550-D CH.
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11/7/14
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E. Press the BLACK “TEST” pushbutton while reading resistance on the “INS.” scale.
NOTE: Resistance to ground must not be less than manufacturers’ specifications.
F. Disconnect thermocouple leads at engine thermocouple bank, and reconnect one clip to
each of the thermocouple leads. Insure lead terminals are not touching each other at
either end of the cable.
G. Press the BLACK “TEST” pushbutton while reading resistance on the “INS.” scale.
NOTE: Interlead resistance must not be less than manufacturers’ specifications
.
6. INDICATOR TEST PROCEDURE
A. Insure indicator-to-be-tested has remained in the temperature environment sufficiently to
stabilize to the ambient temperature at which testing is to be done.
B. Disconnect at least one thermocouple lead from temperature indicator.
C. Set meter pointer to ambient temperature with meter bezel knob.
D. Rotate the “FUNCTION” selector to “IND.”
E. Connect test lead clips to indicator terminals. Observe polarity: alumel is negative (-) and
connects to the 2312G BLACK clip. Chromel is positive (+) and connects to the 2312G
RED clip.
F. Press and hold the BLACK “TEST” pushbutton while positioning the “CAL. ADJUST” control
for desired test points as read on the 2312G meter’s “
C” scale.
G. Compare readings of indicator-under-test with 2312G indications.
NOTE: Indicator must agree with 2312G reading to within manufacturers’ specifications
.
7. “POTENTIOMETRIC” OR “SERVOED” TYPE INDICATOR TEST PROCEDURE
A. General
(1) The “Potentiometric” or “Servoed” indicator, as they are generally referred to, may be
recognized by its multiple pin electrical connector and the requirement of aircraft
electrical power to operate.
(2) The 2312G may be used to test this type of system subject only to the applicable
2312G indicator test accuracy limitations. (Refer to Engine Maintenance Manual and to
Chapter 2 of this Manual.) On those aircraft that specify greater test set accuracy for
certifying the system, the 2312G may be used only for troubleshooting and general
system performance tests.
