TM 11-6625-3081-23
2-14. MODULE DESCRIPTIONS (cont)
2-14
c. TEST CONSOLE TEST BENCH 2A2
Input Code
ADST
Description
This module tests various channels of analog-to-digital (A/D)
converter 2A2A13 for noise and gain. The tests are made on four
channels of the simultaneous sample and hold card (SSH), differ-
ential input card, and two single-ended input cards.
If an error is detected, a prompt is displayed at the completion
of the test.
The A/D converter channels are checked as follows:
The SSH input is programed for 0.000 vdc. The noise is
measured and recorded.
An output of +7.5 vdc is applied
to SSH input and voltage measured. The recorded noise at
0.000 vdc input is subtracted from the measured voltage
at +7.5 vdc input then compared to an upper limit of
+7.51 vdc and lower limit of +7.49 vdc.
The differential input card input is programmed for 0.000
vdc and the noise measured and recorded. Then +7.5 vdc
is applied to the differential input card input, and the
output voltage measured.
The recorded noise at 0.000 vdc
is subtracted from the measured voltage +7.5 vdc input,
and compared with an upper limit of +7.51 vdc and a lower
limit of +7.49 vdc.
The single-ended input card is then programmed for
0.000 vdc input and the noise measured and recorded.
The single-ended input card is programmed for +7.5 vdc
input and the output voltage measured. The recorded
noise at 0.000 vdc input is subtracted from the measured
voltage at +7.5 vdc input, then compared to an upper
limit of +7.51 vdc and a lower limit of +7.49 vdc.
2-74
