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SECTION
3
Applications
3.1
INTRODUCTION
This section provides
some possible applications
for the Model 7169
Scanner Card and is arranged as follows:
3.2 Coupon Testing: This application uses the Form C relays and on-
card bus to simplify wiring for high voltage PC board insulation resis-
tance testing.
3.3 Cable Insulation
Testing: This application
uses bank switching
and the on-card bus to simplify insulation resistance testing of multi-
conductor cables.
3.2
COUPON TESTING
Standard test procedures
for printed circuit board insulation resistance
testing often call for "soaking" and testing at a different high voltage
levels. Figure 3-l shows pairs of two relays configured for different soak
and test voltage sources as well as provision for shorting the DUT to ref-
erence after testing for safety.
With both channels open, a soak voltage is applied through current limit
resistor Rl. Note that the factory installed jumper can be removed and
replaced with Rl. To apply the test voltage, channel 1 is closed. After
taking the test reading, channel 2 can be closed to discharge the capaci-
tance of the DUT and cabling.
Each Model 7169 allows 10 DUT to be tested using this set-up. The two
on-card buses can also be used to bus the soak and test voltages so that
3-1
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