PFN charge and flashtube firing test

Page Title: PFN charge and flashtube firing test
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MIL-R-50749(MU)

8 August 1973

NOTE: Whenever a malfunnction is first indicated when conductiog tests

4.6.1.4 through 4.6.28, press the manual RESET button and

repeat the test to assure that a valid malfunction exists.

4. 6.1.4 PFN voltage adjustment. Prior to operation, initially

adjust R10 of PFN barge power supply (10559345) for the PFN voltage

determined by test andcrecosded for the transmitter component assembly

(10559479), in accordance with MIL-C-14880. Readjust the PFN voltage

for a laser energy output Of 50 + 5 millijoules. The PFN current shall be

80 microampes maximum

4.6.2 Power turn-on condition test Set the LASER MODE

CONTROL switch to the ON position and observe the lighting of the

pushbutton switches, the indicator readout, and the lighting of the

LASER MODE CONTROL switch to determine compliance with 3.3.1.1.

4.6.3 PFN charge and flashtube firing test. Perform the

following to determine compliance with 3.3.1.2:

a. When the RANGE light is flashing (system armed),

press the RANGE button and listen for an audible sound

caused by discharging of the PFN through the flashtube.

b. Press the RANGE button again and observe the RANGE

button lighting sequence and the absence of so and from the

flashtube.

c. Press the RESET button and observe lighting of the RANGE

and LAST buttons.

4.6.4 Tar et selection test. Conduct the tests in steps 1

through 18 of + e IX. The displays and readouts on the commanders

control shall be as specified in table IX to insure compliance

With 3.3.1.3.

4.6.5 RESET switch test. Conduct the tests in steps 1 through

8 of table IX to insure compliance with 3.3.1.4. (This test may be

performed concurrently with the test of 4. 6.4; )

4.6.6 LASER MODE CONTROL switch test

4.6.6.1 TEST Position test. While conducting the tests in

steps 1 and 2 table IX, listen for any audible sound from the flash-

tube to determine compliance with 3.3.1.5.1. The lighting of the

RANGE button and target selection (3.3.1:3) shall also be observed to

determine compliance with 3.3.1.5.1.

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