TM 1-6625-476-30
3-4
3-6. TEST DESCRIPTION. (CONT)
SELECT TESTING OPTION FROM MENU BELOW:
AUTOMATICALLY EXECUTE ALL TESTS IN ORDER........................................ (1)
<RETURN>
ELECTRONICS TEST.......................................................................................... (2)
<RETURN>
BORESIGHT TEST .............................................................................................. (3)
<RETURN>
MODULATION TRANSFER FUNCTION (MTF) TEST ......................................... (4)
<RETURN>
AUTOMATIC CONTROL MODULE (ACM) TEST ................................................ (5)
<RETURN>
NOISE EQUIVALENT TEMPERATURE DIFFERENCE (NETD)/
MINIMUM RESOLVABLE TEMPERATURE (MRT) TEST .................................... (6)
<RETURN>
SYSTEM INTENSITY TRANSFER FUNCTION (SIT) MAX & MIN TEST ............ (7)
<RETURN>
ELECTRO-OPTIC NOISE (EON) TEST ............................................................... (8)
<RETURN>
CHANNEL BALANCE TEST ................................................................................ (9)
<RETURN>
DISPLAY MENU USE INSTRUCTIONS............................................................... (10) <RETURN>
DISPLAY STATUS OF TESTS (PASSED/INCOMPLETE) ................................... (11) <RETURN>
TERMINATE TESTING......................................................................................... (12) <RETURN>
Paragraphs a through i below explain test options 1 through 9. Options 10 through 12 are not tests, and
do not require explanations.
a. AUTOMATICALLY EXECUTE ALL TESTS IN ORDER. You should normally select this option to
begin testing a PNVS NSA UUT. Also select it if you are not sure which specific test you want to run. At
the AVIM level, the program will run tests 2 through 6. At the depot level, it will run tests 2 through 8. If
other menu selections have already been successfully performed, however, only those that have not
passed or have not been selected will be performed. If the PNVS NSA passes all tests, an ALL TESTS
GO prompt will appear on the VDT.
b. ELECTRONICS TEST. This test checks the electronics circuits in the NSA. Included is a functional
test and timeout check of the cooler. As proper operation of the cooler is essential for accurate optics
performance, you should not perform any optics tests until the NSA has successfully completed the
electronics test. You can bypass this test when you reenter the program to run individual tests, but only if
the cooler temperature sensor indicates that the NSA is cooled.
c. BORESIGHT TEST. This test checks boresight. If boresight is out of tolerance, you will be directed
by the program to adjust potentiometers on the boresight CCA. During boresight test, you will be asked if
a white triangle is present on the video monitor, in order to verify that the visual relay/multiplexer vidicon
beam current has not drifted out of specification during operational use. If the triangle is not white, you
will be directed to replace the visual relay/multiplexer. If excessive dead or noisy channels are observed,
you will be directed by the program to perform channel balance.
d. MODULATION TRANSFER FUNCTION (MTF) TEST. This test checks the resolution performance of
the PNVS NSA. If MTF is out of tolerance, you will be directed to adjust the IR focus potentiometer, the
IR focus ring, or the visual multiplexer lens.
