Table of Contents
Advertisement
1. MOVING COIL TYPE INDICATOR TEST PROCEDURES
A. System Lead Resistance Test Procedure
1. Access the aircraft system temperature indicator
2. Disconnect thermocouple leads from the indicator.
3. Connect the standard leads to the Test Set's TEST connector.
4. Press the Test Set PWR pushbutton.
5. Set the FUNCTION switch to RES MEAS.
6. Set the RANGE switch to 200 Ω.
Note: The mV, °F and °C pushbuttons are inactive. The settings for the SYS RES,
TEMP ADJ and FINE control knobs have no effect.
7. Carefully connect test lead clips to aircraft lead wires insuring a good electrical connection.
8. Connect the red clip to the Chromel lead and the black clip to the Alumel lead.
9. Press and release the PTM pushbutton.
10. Ensure that the display shows resistance in Ω with a 0.01 Ω resolution.
11. If display reads "OUT OF RANGE", the resistance is greater than 199.99 Ω or there is an
open circuit.
12. Exchange the RED and BLACK test clip connections and verify the display repeats the
same reading when the PTM pushbutton is pressed. If reading does not repeat, the engine
thermocouples may be hot. (Refer to Hot Engine Testing, Chapter 3, section 1.D.).
Note: Resistance must be within the manufacturer's specifications. If results are slightly
outside limits, repeat entire procedure to ensure test failure is not due to human error.
13. Press the PWR pushbutton to power down the Test Set.
14. Disconnect the Test Set from the aircraft wiring.
15. Return the aircraft to its original configuration.
B. Thermocouple Resistance Test Procedure
1. Access the aircraft thermocouple leads at the appropriate system break.
2. Disconnect the thermocouple leads from the aircraft wiring.
3. Connect the standard leads to the Test Set's TEST connector.
4. Press the Test Set PWR pushbutton.
5. Set the FUNCTION switch to RES MEAS.
6. Set the RANGE switch to 200 Ω.
Note: The mV, °F and °C pushbuttons are inactive. The settings for the SYS RES,
TEMP ADJ and FINE switches have no effect.
7. Carefully connect the test lead clips to the aircraft lead wires ensuring a good electrical
connection.
56-101-00930 Revision H
CHAPTER 3: TEST PROCEDURES
Page 11
Advertisement
Table of Contents
