Re: HV probe for primary measurements

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

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


High voltage dividers are basically multi-stacked high voltage resistors in
a divider configuration but also include a number of capacitors and such as
well.  It should be fairly easy to build your own divider (especially if you
just want to look at your primary) although you may have to build a more
elaborate network divider to properly capture high frequency and pulse
waveforms.

If you are interested in a current transformer, I could sell you one.  I
have a few large ones if anyone is interested.  Basically its 1V per Amp and
it terminated to a 50 ohm.  I'll sell these for $30.00 apiece if you are
interested.

Dan



> I would like to use my CRO to examine the waveforms in my primary
> circuit during operation. Can someone point me in the direction of
> some suitable schematics for either a HV probe or some kind of
> current transformer metering device? I saw Terry's setup using the
> optocouplers, but I can't find any schematics or theory of operation.
> Can I just use a big string of resistors? The idea of directly
> measuring the primary voltages and currents, quite frankly, scares
> the utter crap out of me. But I am determined to investigate them. I
> will NOT be touching the CRO during operation as a result. I just
> don't want to go anywhere near it.
>
> What about making a current transformer by winding some wire around a
> ferrite core?
>
> Cheers,
>
>
> Greg.
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