Re: Current Transformer problems

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Do you have a termination on the sense coil? Or, are you just running some
coax from the sense coil to the scope input (nominally 1 Meg, 20 pF)
Have you tested it with a resistive load (i.e. run AC  to a lightbulb,
instead of the TC, and look at the current waveform.)?

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, November 26, 2001 7:51 PM
Subject: Current Transformer problems


> 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.
>
>