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Old 02-25-2012, 05:19 PM   #4
b700029
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Join Date: Sep 2010
Posts: 640
Default Re: Circuit voltage measurement problem.

Take your measurements relative to the - pin on the rectifier (i.e. put black probe of DMM on it.) The + pin should give approximately 1.4 times your line voltage (~340V for 240V mains, ~170V for 120V mains.)

You can also remove the rectifier and check its 4 diodes separately out-of-circuit.
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