switches set the three-digit octal code corresponding to the desired pulse
repetition frequency (PRF), with code switch A representing the most
significant bit, and code switch C the least significant bit.
checks the operation of the switches, the PRF accuracy, and the laser pulse
When the LD/R is in the AZ ADJ mode or fired in the range mode, AZ and EL
data displays in the eyepiece.
Since during testing, the TU is not
connected, use the Resolver Tester to simulate the TU resolver signals.
This part of the test verifies the determination of AZ and EL coordinates.
j. Ranging Test.
The ranging test verifies proper range and range
return data. The DES/RNG1/RNG2 switch commands the microprocessor to fire
the LD/R in the appropriate range mode.
simulator circuit to simulate the video pulse. The test verifies the proper
range determination and the range return discrimination (RNG1 or RNG2).
k. RCT Interface Test. This test checks the interface circuitry used
with the FIST vehicle controls.
The remote capabilities tester (RCT)
simulates the FIST controls. When you use the RCT, the LD/R POWER switch
A1W2S1 must be ON. The RCT disables and replaces the functions of the mode
switch, the code switches, and the reticle brightness control. This enables
you to check the operation of the FIST controlled circuits within the LD/R.
l. Receiver Test. The receiver test checks for proper reflected pulse
detection, and the generation of the video pulse. When the LD/R fires in
the range mode, the receiver activates and senses the reflected laser pulse.
counter at the appropriate time. Appendix B lists the step-by-step test and
troubleshooting procedures for the receiver test.
Upon completion of testing, or when directed by the testing or
troubleshooting procedures, you must shut down the equipment as described
External Power Supply
Set the power switch to off.