Verifying Electrical Voltage - PictureTel Concorde 4500 Servicing Manual

TROUBLESHOOTING
Verifying
Electrical Voltage
4-24
A licensed electrician must perform this veriÞcation.
The voltages present can cause fatal injury.
Have a licensed electrician test the current from the electrical wall
connection and make sure that the current meets engineering
speciÞcations if the
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Have a licensed electrician verify the electrical voltage, as follows:
1. Make sure that the main AC power cable is not connected to the
system, and plug the cable into the wall outlet.
2. Verify that the AC voltage from the wall outlet meets specifications.
Do this by plugging the leads from a digital voltmeter into the
system end of the cable in each of the following two positions:
a. Plug the voltmeter leads into the hot and neutral leads of the
AC cable.
b. Plug the voltmeter leads into the hot and ground leads of the
AC cable.
3. Verify the AC power cable by plugging one voltmeter lead into the
neutral lead and the other voltmeter lead into the ground lead.
The reading should be under 1 VAC.
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