Can you fellow techs explain the why/how of using an AC Voltmeter? I've read a bit about it on a few sites and I don't have a full grasp on it.
Thanks!
Thanks!
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Re: AC Voltmeter?
The second link hides some food for thought for expert boys.
Since the initial writing of this paper, a few ultra-low priced meters have become
available. These are typically made in China and retail for less than ten dollars, and often less than five
dollars. These meters employ a different approach to measuring AC voltage. It was discovered that they
simply eliminate the negative portion of the voltage wave by means of a half-wave rectifier, take the
average of the positive portion, and double it. That is, AC voltage = 2 times the average of the positive half
of the voltage wave. This type of meter can easily be identified because it will not register any AC voltage
if a battery is placed on the test leads with negative polarity, but will show twice the DC value of the battery
voltage if the battery is placed on the test leads with positive polarity.Comment
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Re: AC Voltmeter?
For badcaps.net repair projects we rarely need to measure AC.
Having said that, it is nice to know how a multimeter measures AC. This video might answer some questions?
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