Re: AMP meter solutions

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

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

Hi James,

	A standard CT should work fine at 60Hz.  Perhaps the current (if your
running a TC) is just to messy for the CT or meter to measure well.  You
have to load the output of the CT as recommended.  Some have a current
output and others a voltage (internal resistor).

Newark and places like http://www.simpsonelectric-dot-com/ sell and have data
on their brand of CTs.  Of course, just a high current shunt with an AC
meter will do the trick to.

http://www.simpsonelectric-dot-com/accind.htm
http://www.simpsonelectric-dot-com/pdf/webpdfg/Donut%20Current%20Transformer.pdf

Cheers,

	Terry


At 08:03 PM 1/13/2001 -0700, you wrote:
>Hi all,
> I have been fooling around with a current ratio transformer to monitor
>current in my controller.  It is a 60/5 ratio. I need to measure up to
>50 to 60 amps.  I can get reasonable readings using a couple of methods
>but they both have the same prob. The response is not linear. However I
>am sure the thing should be quite linear. There was an article in
>Circuit Cellar Ink a few years ago that said so, and showed a method to
>use them.
> Rather than telling you what I think I'm doing wrong, I am hoping
>someone can just tell me how to do it right!
> I'm not married to this though. Any cheap, analog, metering will do.
>Does anybody really like to use those 50amp/50mvolt shunts? I can't seem
>to find an analog meter it the right range to use a shunt. A local
>surplus house has 50 amp shunts for 12 bucks, but not meters.
> What are you guys doing? Any suggestions? BTW I can't seem to find a
>thing on the net about current ratio transformers except sale catalogs.
>Thanks for any help.
> James T
>