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MAINTENANCE -
, ______________
~DO
OVERVIEW
The HP 98640A's A -to-D card does not require adjustment but periodically you may want to verify
that it is functioning properly. By following the procedures detailed below you can check the opera-
tion of all A -to-D cards installed in your system. Verifying the correct operation of the A -to-D
card(s) may require you to attach certain peripherals which may not be part of the normal configura-
tion of your 9000 Series 200 computer. Below we list the required peripherals.
PREPARING TO TEST THE A-TO-D
CARD
Minimuml equipment requirements
To run the verification program you will need the following peripherals, interfaces for the peripherals,
and software for your computer:
a. Keyboard
b. Video display
c. Disk Drive
d. Diagnostic Diskette to fit your disk drive:
3.5 inch disk, part number 98640-13301, or
5.25 inch disk, part number 98640-13601
e. Test Assembly, part number 98640-67950
Installin~J
test assembly
DISCONNECTING THE WTA
If you have a.lready installed the wire termination assembly (WTA) you will have to power down your
system before you remove it. If you have already wired your computer to an analog circuit with this
analog interface DO NOT POWER DOWN YET. You must determine how to proceed based on your
circuit design and the specifications of the HP 98640A. Also see Appendix A for more information.
~'WARNING
BEFORE POWERING-DOWN BE SURE THE PATH
TO GROUND THROUGH A lkOHM RESEITOR THAT
WILL
RESULT
WILL NOT CAUSE
EXCESSIVE
CURRENT TO FLOW FROM SOURCES A TT ACHED
5-1
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