Simplex 4100 Installation Manual page 40

4100/4120 INSTALLATION MANUAL
10. Verify the ground status of the system by connecting the negative (black) lead of a voltmeter to the Earth
Ground and connect the positive (red) lead of the voltmeter to the positive (+) terminal of the 24V DC
supply and check for the following readings:
Voltage Reading
12-14V DC
6-12V DC
15-21V DC
Document No: 4100-M002
Circuit Status
Normal
Partial Negative Ground
Partial Positive Ground
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