TM 11-6625-3081-23
7-26.
ANALOG-TO-DIGITAL (A/D) CONVERTER 2A2A13
7-26
INPUT CODE: ADST
a .
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), differential 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 programmed 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.
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