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Re: HV Meter - Not AC RMS?
Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>
Tesla list wrote:
>
> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jimlux-at-earthlink-dot-net>
>
> At
>
> > Over 50 years ago I used one of those Sensitive Research
> > voltmeters to
> >measure the output of HV power supplies for CRT displays, but never had
> >occasion to try it for AC, and never had an instruction book. Can you
> >quote that part of the instruction book where it describes "this meter
> >can only measure DC or PEAK AC"? I can't see how it could measure PEAK
> >AC and still give the reults you report in your later post. If it would
> >indicate peak AC it would indicate RMS as will.
>
> > I can't see how any
> >electromechanical device could measure peak...
>
> Some form of slip clutch that allows the needle to move up easily, and
> slowly drift back down with a fairly long time constant.
Well, I guess so. But would it then be reading the peak value of an
RMS reading for a frequency much higher than the reciprocal of the time
constant?
Ed