Re: Ammeter Question

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

Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com> 

Have you ever examined the waveform of a transformer like this? It cannot be
read with a standard meter as far as I know seeing as it is not a sinousidal
waveform.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, January 12, 2004 12:42 PM
Subject: Re: Ammeter Question


 > Original poster: "Peter Terren" <pterren-at-iinet-dot-net.au>
 >
 > To make an ammeter, I used the smallest mains transformer I could buy or
 > scrounge. eg old 9 v power pack. Remove the low voltage secondary windings
 > and discard.  Wrap 1 1/2 to 2 turns of heavy wire in place of the
secondary.
 > When current passes through the heavy winding a voltage gets induced in
the
 > other winding such as 10 - 50 VAC. depending on the transformer.  This is
 > rectified by a bridge rectifier and smoothed with a small eg 1uF
capacitor.
 > This can be dropped with resistors to a suitable voltage for whatever
spare
 > voltmeter you have or scale you are using. Calibrate it with a device of
 > known wattage eg fan heater and there you have it. Stepping up the voltage
 > in this way removes most of the non-linearity created by the fixed voltage
 > drop with the bridge rectifier. I've used this technique to keep mains
power
 > away from the meters in my control board.
 >
http://members.iinet-dot-net.au/~pterren/tesla_coil_latest.htm#The%20variac%20control%20box
 > Cheers
 > Peter (Tesla Downunder)
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Monday, January 12, 2004 4:24 AM
 > Subject: Re: Ammeter Question
 >
 >
 >  > >Original poster: "Aaron Aab" <striker754-at-earthlink-dot-net>
 >  > >Where can I find an AC ammeter to go inline with my hot power supply?
I
 >  > >would like to be able to measure the amps the transformers are
drawing.
 >
 >
 >