How can i using volte meter to test the a\c circet?

First, as always use reasonable caution. In the process of testing, the probes will be energized with enough voltage to do some harm. Be careful not to touch the bare ends of the probes.





To test for proper voltage -- set the meter to AC mode. If the meter has multiple settings for AC, select the one that is the lowest over 150 volts. Insert the plug end (shorter end) of the black probe into the common connection socket and the red into the AC socket.





Begin by placing the one probe tip in the wider flat vertical slot and then the other in the narrow flat vertical slot. Read the meter, you should have between 108 and 125 volts. You may need to move the probes around in the slots a bit to get a good reading.





If this is a two wire outlet without a ground, that is about all you can do with any accuracy.





If this is a grounded outlet, a couple more things to check. Insert one probe into the half circle shaped hole above or below the two flat slots, then insert the other probe into the wider slot. You should get a very low reading, less than 0.5 volts. If you get a reading similar to the first, then the neutral and hot wires are likely reversed. A reading less than the first but greater than 0.5 volts can indicate either a problem with the ground wire or neutral wire connection somewhere between service panel and the receptacle.





Finally, insert one probe into the half circle shaped hole, the other into the narrow slot. This reading should be similar to the first. More than 0.5 volts less than the first indicates a problem with the ground connection. Greater than 0.5 volts more than the first indicates a problem with the ground connection. A very low reading here is an indication that the neutral and hot wires are reversed.

How can i using volte meter to test the a\c circet?
depends what exactly you want to test?
Reply:I am assuming that your are talking about a window/wall A/C that is running off a 120V outlet?





Make sure your meter is set for AC current. Since it is AC current it does not matter which lead you stick into which side of the outlet. It should read no lower than 115Volts and no higher than 130Volts.
Reply:you should get a reading of 123 . if you place the red one on


the left hand side of your outlet,and the black on the right hand side , this will give you 120volts

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