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Re: Current Transformer problems
Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
The current transformer needs a low value resistor across it. Like 10 ohms.
The voltage across the resistor represents the transformed current.
Without a resistor, you get high voltages with all kinds off odd signals.
At 06:58 PM 11/26/2001 -0500, you wrote:
> 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
> 1. What am I doing wrong?
> 2. How can I fix it?
> Matt D.