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*To*: tesla-at-pupman-dot-com*Subject*: Re: KV meter*From*: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)*Date*: Sun, 08 Oct 2000 15:32:16 -0600*Delivered-To*: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla list wrote: > > Original poster: "David Euans" <davidwe-at-telocity-dot-com> > > I am trying to build a 50 KV high voltage meter for directly measuring > the voltage from my various high voltage transformers. I have tried > using a 100 microamp full scale DC meter with one 250 (32 KV) megohm > resistor on each leg and an 80 KV diode string (four 20 KV units) > directly off of one side of a 9 KV neon sign transformer in series with > one of the 250 megohm resistors, but I get faulty readings each time. Make an attenuator first, and measure the resulting low voltage with a conventional meter. You can even dispense the high-voltage resistors and use a capacitive divider. For example, make a simple Leyden jar capacitor with 100 pF of capacitance (very easy to sustain 50 kV with this) and connect in series with it a normal low-voltage nonpolarized capacitor with 1 uF of capacitance. This makes a 10000:1 attenuator with low-impedance output. Measure the AC voltage over the 1 uF capacitor. 50 kV will appear as 5 V. The attenuator will drain 1.9 mA from the transformer at 60 Hz. Antonio Carlos M. de Queiroz

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