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Page Title: j. Indicator And Thermocouple Leads In Series Test Procedure
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TM 55-6695-220-13&P j. Indicator And Thermocouple Leads In Series Test Procedure.  Disconnect the positive thermocouple lead from the indicator and reestablish the airplane circuit by connecting the positive tester clip lead to the positive terminal on the indicator and negative clip lead to the positive thermocouple lead.  Since the thermocouple leads maintain the proper circuit resistance, set the RESISTANCE AND VOLTAGE FUNCTION SWITCH to zero ohms.  Follow the procedures in paragraphs 2-1e.  through i.  as appropriate to complete the test. NOTE The    indicator,    thermocouple    sensor,    and    leads    must    be    at    the    same    ambient temperature   in   order   that   the   potential   thermal   millivoltage   output   does   not   add significantly to the tester output. k. Servo Thermocouple Indicator Test Procedures.  Apply power to the indicator as delineated in the service manual and allow it to stabilize at ambient temperature for 30 minutes under these powered-up conditions.  If the indicator is self-lighted, disconnect the lamp circuit during the tests.  Use a short length of copper wire to establish a circuit between the (+) jack of the TESTER STANDARD ONLY pin jacks and the (+) side or chromel wire connection as delineated in the manual for the indicator.  Likewise use a short length of alumel or constantan wire to form a circuit between the (-) jack and the (-) side or alumel wire connection on the indicator.  To retain the calibration of the tester connect a 42 ohm resistor across the tester's clip leads. 2-6

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