Re: Digial Voltmeter DC and AC mode
- From: John Larkin <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 26 Apr 2005 17:28:21 -0700
On 26 Apr 2005 15:32:50 -0700, "aman" <aman.bindra@xxxxxxxxx> wrote:
>I dont understand the real meaning of DC and AC readings on the Digital
>voltmeter. Is it correct to say that if the signal = DC component + AC
>component then DC reading gives the DC component and AC reading gives
>the AC component ?
Usually, yes. On most DVMs, the DC range is heavily averaged/lowpass
filtered, so the AC component is mostly ignored. And on the AC range,
it's AC-coupled, and response drops off below 10 Hz or something like
that, so the AC range ignores any DC component entirely.
It needn't be so, though: some meters read the *true* RMS voltage on
their AC range, which includes any DC component; but that's rare.
I think the old analog Simpson-type VOMs may have responded to DC on
their AC range. Anybody know for sure? Did they have a series cap, or
just a rectifier and the meter movement?
John
.
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