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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