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OPERATIONAL VERIFICATION
The WEF IFY program may be used to verify the proper operation of the HP 3421A Data
Acquisition/Control Unit and the optional multiplexer or digital I/O cards.
Note that the verification
procedure just verifies that the equipment is functional.
The procedure does not verify that the
equipment is operating within specification tolerances.
The "EF IF" program uses the Diagnostic Terminal Block (or DTB), also called the Option Assembly Test
Fixture (03421-66504) to test the option cards. The verification procedure performs the following steps:
e Verifies proper communication with the HP 3421A.
e¢ Reads the status registers to determine the configuration.
oe For each option card, prompts for the installation of the DTB, and checks the operation of
each channel on that card.
14.1 RELAY CARD TEST
The 10-channel multiplexer assembly test measures the total resistance between the high and low
terminals for each relay acquisition channel, using a known resistance of 100QQ +/- 0. 1% (part of the DTB)
placed across the input terminals. This checks the resistance of the relay contacts and will indicate either
a bad relay, or PC board leakage due to corrosion, contaminants, etc.
10 CHANNEL MULTIPLEXER ASSEMBLY
|
[ - TOP CONTACTS
i - BOTTOM CONTACTS
3
4
5
6
CaoaoRoaon0ncadnoncai
10 CHANNEL MULTIPLEXER
F
T
R
N
0
8
$B]
13
Al
RZ
RAI
R4
RS
REG
RT
RS
CIAGNOSTIC TERMINAL BLOCK
(OPTION ASSEMBLY TEST AXTURBE
03421-66504
;
;
The resistance of each channel (0-9) on the card is checked sequentially, using the 2-wire ohms function.
Channels O and 1 are first checked to see if they are actuators. If they are actuators, the actuator channel
14-1
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