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Measurement Techniques


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From:  terryf-at-verinet-dot-com [SMTP:terryf-at-verinet-dot-com]
Sent:  Sunday, August 16, 1998 5:43 PM
To:  tesla-at-pupman-dot-com
Subject:  Re: Measurement Techniques

Hi Tony,
        I have information a field probes and fiber-optic probes at my site:

http://www.peakpeak-dot-com/~terryf/tesla/experiments/experiments.html

They are under the "A New Methode....." section.

Main page at:

http://www.peakpeak-dot-com/~terryf/tesla/main.html

They will measure everything you mention.  The field probes are very easy to
make and will do most of what you what.  The fiber probes (I now have a much
better version) can measure all the primary currents and waveforms but they
are fairly conplex to build.  The field probes are almost all I use any
more.  A good 40kV DMM probe runs about $100.  A very nice thing to have.
You can contact me off list also.  I am very involved with TC measurements
and I "know" things.

        Terry Fritz

terryf-at-verinet-dot-com




At 02:46 PM 8/16/98 -0400, you wrote:
>I am getting close to final assembly of my first coil and I am looking
>for information on measuring various characteristics.  I have a DMM.  I
>can borrow an I-Scope, a current probe, and a signal generator, but I do
>not have access to a high voltage probe.
>
>The coil will be powered by 3-4 15 Kv 30 ma NSTs.  The secondary is
>8.4"x40".  The cap is a .0228 ufd pulse discharge cap.
>
>I have seen bits of information on this in other posts, but I am looking
>for more complete ideas on measurments.  There are many things I would
>like to measure but the following is an initial list in decreasing order
>of importance:
>
>-Secondary coil resonant frequency
>    I plan to do this with the equipment I have
>
>-Primary current waveform
>    I need this to monitor gap quenching.  I am using NSTs and don't
>have any part of the primary grounded.  How can I measure this without
>damaging the O-Scope?
>
>-Secondary current waveform
>    I should be able to measure this at the base of the coil with the
>current probe.  I may need to build a new current probe from a small
>toriod and shield the leads so that I can get the O-Scope far enough
>away for safety.
>
>I have seen comments about building field probes.  I am looking for
>details on this.  I am also looking for practicle suggestions on
>triggering.
>
>I hope to measure the secondary resonance next weekend, 8/22, and have
>the coil running sometime in September.
>
>                Thanks,
>                Tony Lekas
>
>