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Operational Verification
is closed simultaneously with another channel, shorting out the 100Q resistor on the other channel. The
sum resistance should now only include two sets of relay contacts and the fuse in the actuator channel.
The program checks for a value of <3. 1Q
Channel 2 on the relay card may have a 900K(Q resistor in series, and a 101. SKQ resistor in parallel, with
the channel as part of a "divide-by-10" network. When the 1002 load from the DTB is added to this
circuit, the theoretical total load resistance for channel 2 is 91216Qto 91307€2 If it is in this range, the
"divide-by-10" circuit is in use and the test passes. If it is outside of this range, channel 2 is assumed to be
the same as a standard acquisition channel.
Standard acquisition channels (3-9, and 0 through 2, depending upon the configuration) are checked for a
resistance in the range of 99.9Q to 101.650
If the relay card being tested has been modified with additional "divide-by-10" networks (part of
accessory package 44469A), those channels will fail the test.
14-2
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