Roll ILCA Simulator Performance Tests

TM 55-4920-430-13

(5) Disconnect. the digital multimeter from No. 1 power supply and the decade resistor (6). Con-

nect the digital multimeter set to read 20-volt ac, across receptacle pins J1- W (line) and J3-AA. The

multimeter shall indicate less than 0.03 volt ac.

(6) Connect No. 2 power supply across receptacle pins J3-A (+) and J1-C.

NOTE

When a test includes a requirement that an ac voltage be in-phase or

out-of-phase, oscilloscope channel A must be connected across the

digital multimeter. Oscilloscope channel B must be connected to the ac

source and the oscilloscope externally triggered from the ac source.

(7) Adjust the output of No. 2 power supply to +28 volts dc. Monitor the Feedback No. 1 output

on the multimeter. Within 1.6 to 2.4 seconds, the multimeter shall indicate 3.0 volts ac, in-phase. The

indication shall rise to 4.45 to 5.05 volts ac, in-phase.

(8) Set the PITCH switch to RESET. The multimeter shall indicate less than 0.03 volt ac.

(9) Disconnect the positive lead of the multimeter from receptacle pin J1-W. Connect it to recep-

tacle pin J l-L.

(10) Set the PITCH switch to OPERATE. Monitor the Feedback No. 2 output on the multimeter.

Within 1.6 to 2.4 seconds, the multimeter shall indicate 1.5 volts ac, in-phase. The indication shall rise

to 2.18 to 2.58 volts ac in-phase.

(11) Set the PITCH switch to RESET. The multimeter shall indicate less than 0.03 volt ac.

(12) Disconnect the positive lead of the multimeter from receptacle pin J1-L. Connect it to recep-

tacle pin J l-N.

(13) Set the PITCH switch to OPERATE. Monitor the Feedback No. 3 output on the digital mul-

timeter. Within 1.6 to 2.4 seconds, the multimeter shall indicate 1.5 volts ac. The indication shall rise to

2.18 to 2.58 volts ac, in-phase.

(14) Set the PITCH switch to RESET. The multimeter shall indicate less than 0.03 volt ac.

(15) Reduce the output of both power supplies to O.

(16) Disconnect the multi meter.

(17) Disconnect No. 2 power supply.

( 18) Disconnect No. 1 power supply and decade resistor.

4-55. Roll ILCA Simulator Performance Tests. This test insures the test set provides independent

simulation for the two servo amplifier outputs of the AFCS computer in the roll axis. The positive input

test simulates the actuator extending. The negative input test simulates the actuator retracting. Feed-

back No. 1 simulates the self-feedback. Feedback No. 2 is one-half of the cross-feedback. Feedback No.

3 is the other half of the cross-feedback.

a. Positive Input test.

(1) Set the test set power switch to ON.

(2) Set the SERVO SIMULATION ROLL switch to OPERATE.