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98640A Analog Input Interface
TESTS PERFORMED
Six tests are conducted on each A -to-D card specified for test. The six tests are:
Handshake Tests
Pace Tests
Calibration Tests
Reading Accuracy Tests
Amplifier Slew Rate Tests
Common Mode Over range Tests
Program run
The verification program will first scan all the I/O cards searching for ID 18 (ADC) interface cards,
and will report the select codes of all found. The select code(s) must correspond to those you set with
switches 1 through 5 on the DIP switch (S\V
1).
If the codes do not match and the switches are correct-
ly set, the card has failed even if it passes all other verification tests. See the heading "On Failure"
below.
If no A -to-D cards are found the verification program will report "No ADCs were found installed".
Then the program will ask the repeat program question.
INST ALLED ADCs
After reporting the select codes of all installed A -to-D cards the verification program asks "Do you
wish to verify all ADC cards
(YIN)
?". If the answer is no the programs asks "Verify ADC in select
code n
(YIN)
?" for each A -to-D card installed replacing n with the select code. If all responses are
negative, the verification program branches to the repeat program question.
SET REPETITIONS
If any card tests are to be done, the verification program then asks "Specify Repetitions, 0 Repeats
Forever, Number of Times to Repeat (default
1)
?". The tests are repeated the specified number of
times, looping forever if 0 or a negative number is specified. If the verification program is to loop for-
ever, the message "Hit <STOP> To Terminate Tests" will be displayed. At any time the test may be
aborted by hitting the <STOP> or <CLR I/O> key; the program will display a message "ADC
Verification Program Stopped By User" and branch to the repeat program question.
Each repetition for each card will take about 2.5 seconds.
P ACE TIMER TEST
Once the number of repetitions is specified, the verification program then asks "Include Pace Timer
Tests (Y /N) ?". Since the pace timer tests take 99 seconds to execute it is sometimes advisable to skip
these tests.
SELECT READINGS TO DISPLAY
Next the verification program will ask "Display All Readings On CRT (Y /N) ?". If the answer is yes,
the verification program will display all tests it makes and the measurements taken for those tests. If
the answer is no, the verification program will ask "Display Errors On CRT (Y /N) ?". If the answer is
5-4
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