Home Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Loaded vs. Unloaded AC Voltages.

If you measured this without a load present, then what you are measuring is the capacitive voltage divider action of the filter caps, modified slightly by the fairly high load impedance of your AC voltmeter.

In other words, the measurement is not a "real world" measurement, it is a false indication of the voltages.

Try plugging in a lamp or an audio component (preferably an entire system), and then measure the voltages. They should be more along the lines of what you expect. Note that the N to E voltage is hardly ever zero, there is almost always SOME reading, which could amount to several volts. However, it should not be very high (say into double digits) with a load present.


Jon Risch


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