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Re: Current Transformer problems



Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>

Matt
Do you have a terminating, non-inductive load resistor on the CT?  A CT should
ALWAYS have a terminating load resistor.  Without it, open circuit voltage can
become so high as to destroy the CT and present a serious or fatal shock
hazard.
Regards
Dave Sharpe, TCBOR
Chesterfield, VA. USA

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Mddeming-at-aol-dot-com>
>
> Hi All,
>          This question is for anyone with experience in use of current
> transformers and O-scopes.
> I made a quick current transformer by winding 20 ft (~150 turns) of #20
magnet
> wire around a 1-inch ID ferrite toroid When I hook it to my scope I get a
wave
> pattern that is very distorted with overtones, 2f, 4f, etc., and pulses of HF
> ringing.
> This is on the inlet side of the control box without the coil or cap
attached.
> The entire lab is lined with grounded wire mesh except the front door.
> 1. What am I doing wrong?
> 2. How can I fix it?
> Matt D.