Re: Electrostatic Meters

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>


>Sounds as if that meter has included the rectifier so it COULD measure
>peak, and therefor would seem to need some sort of bleeder resistor
>across it to set the time constant with which to measure the peak.
>Diode and/or bleeder leakage would negate the main advantage of ES
>meters - ultra high input resistance.  On the subject of ES meters I
>looked at Bureau of Standards Circular No. 74, and found specific
>references to the use of "electrometers" (same configuration, higher
>sensitivity) to measure RF voltage.

         Same configuration as what?
         Classically:
                 electrometer refers to two vanes, charged
                 ALIKE, which repel each other.
                 Common class room version does not indicate,
                 but can be made to do so.

                 'electrostatic voltmeter' uses INSULATED
                 vanes, which attract....

         The later term is perhaps a bit confusing as BOTH use
         'electrostatic' effects.


>     Either should work with a CW VTTC, where the RMS value is meaningful,
>but wouldn't give a useful answer for the typical disruptive TC.

         RMS is always meaningful.  Its easier to understand on CW...


-- 
         best
         dwp

...the net of a million lies...
         Vernor Vinge
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         -me