Re: Current Transformer problems

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Matt,

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.

Cheers,

        Terry


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
> door.  
> 1. What am I doing wrong?
> 2. How can I fix it?
> Matt D.