YAW ILCA Simulator Performance Tests (CRC)

55-4920-430-13

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

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

(17) Disconnect the multimeter.

(18) Disconnect No. 2 power supply.

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

4-56. YAW ILCA Simulator Performance Tests (CRC). (See fig. 4-9. ) This test insures the test set

provides independent simulation for the two servo amplifier outputs of the AFCS computer in the yaw

axis. The positive input test simulates the actuator extending. The negative input test simulates the ac-

tuator retracting. Feedback 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 SERVO SIMULATION YAW switch to OPERATE.

(3) Connect the positive terminal of No. 1 power supply to one side of the decade resistor. Connect

the other side of the decade resistor to receptacle pin J1-HH. Connect the negative side of the power

supply to pin J l-v. Set the decade resistor to 1000 ohms.

(4) Connect the digital multimeter across the decade resistor, positive lead of the multimeter to

the positive output of the power supply. Set the multimeter to the 2 volt ac range.

(5) Adjust the output of the power supply for +0.100 volt dc on the digital multimeter.

NOTE

This applies approximately 0.1 milliampere of input current through J1-

HH.

(6) Disconnect the digital multimeter from the power supply and decade resistor.

(7) Connect the digital multimeter, set to measure 20-volt ac to receptacle pins J1-FF (line) and

J3-AA. The multimeter shall indicate less than 0.03 volt ac.

(8) Connect No. 2 power supply across receptacles pins J3-A (+) and Jl-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.

(9) Adjust the output of the power supply to +28 volt dc. Monitor the Feedback No. 1 output on

the digital multimeter. Within 1.6 to 2.4 seconds, the multimeter shall indicate 3.0 volt ac, out-of-phase.

The indication shall rise to 4.45 to 5.05 volt ac, out-of-phase.

(10) Set the YAW switch to RESET. The digital muitimeter shall indicate less than 0.03 volt ac.

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

tacle pin J1-BB.