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To observe the ESU's visual or audible alarm:
1. With the 50-ohm test load attached to the ESU CQM (REM) input, it
should sense this level of resistance in the "pass zone." Depending upon
the ESU device manufacturer, this pass zone can extend from 135 to 250
ohms. Test load settings over the pass zone activate the CQM alarm.
Refer to the technical support/service manual of the ESU you are
testing for the recommended check-out procedure for the ESU CQM
feature.
2. Increase the test load from 50 ohms until the CQM alarm sounds. The
value at that point is the CQM alarm resistance.
Supply
Mains
Earth
ESU
X No connection
ACTIVE
DISPERSIVE
ESU CQM
CQM
Figure 3-2. Basic CQM Check
Note
Basic CQM Check
(Contact Quality Monitor)
BLU
Main
Test
Load
YEL
Operation
Testing the ESU
RF303
3
exz13.eps
3-9
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