Connecting The Test Assembly - HP 98640A Installation And Reference Manual

9 8640A Analog Input Interface
TO THE WIRE TERMINATION ASSEMBLY OR
AL TER THE CURRENT READ BY OTHER DEVICES
IN THE SAME CIRCUIT WITH THIS INTERFACE.
Once you have taken action to ensure the power-down is safe, power down your system. Now, with
the power off, you can disconnect any devices which may interfere with removal of the wire termina-
tion assembly( -ies). In some cases you may need to free a backplane slot to accomodate peripherals
needed to run the verification program.
You may find it convenient to leave the wires attached to the wire termination assembly(-ies) you are
removing. You may have to loosen your strain-relief or remove the wires if they prevent you from
removing the wire termination assembly( -ies).
Remove a wire termination assembly by simultaneously unscrewing its thumbscrews. Be prepared to
supported the assembly as the screws run out. Pull the assembly straight back, away from the card
cage, to avoid bending the right-angle posts on the A-to-D card.
Put the wire termination assembly aside. If wires are attached to it you may be able to use a cable tie
to hold the assembly out of your way. Do not allow long lengths of wire to dangle from the termina-
tion blocks on wire termination assembly as the wires may be pulled free.
INST ALL PERIPHERALS
Attach any peripherals required to run this test. The instructions for installing a peripheral in your
system are included in the peripheral's documentation or your computer's manual. The peripherals
required to run the verification program are listed above under the heading "Minimum equipment
requirements".
CONNECTING TEST ASSEMBLY
The test assembly is supported by the right-angle posts on the A-to-D card and held in place by fric-
tion. If the test assembly is bumped once it is installed the right-angle posts may be damaged. A test
assembly must be installed on every A-to-D card to be tested.
Orient the test assembly such that the components are up and the mating connectors line up with the
A -to-D card's right-angle posts. Push the assembly forward evenly until the right-angle posts are
well seated in the connectors.
CAUTION
Be sure each right-angle post goes into a mating connec-
tor otherwise the card may be damaged when the power
is turned on. The pressure required to mount the test as-
sembly may be enough to make some 9000 Series 200
computers move.
Now you can test the card by running the verification program.
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