Re: higher current ammeter sources

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

Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

Dave:To form a shunt get a scrap of stainless steel 1 inch wide and about 14
inch long from your nearest sheet metal shop of 22ga or thicker. Fold back 1
inch at each end and silver splder that portion.  Drill a 1/4 in hole in the
lapped ends for connections . Place your meter in series with the shunt and
apply 10 amps of current, With the meter connected to one end of the shunt
and 10 amps flowing through the shunt slide the loose meter connection along
the shunt to read 1 amp mark that point and solder or pop rivet a connection
for the meter at that point. Now when the meter reads 10 amps 90 amps will
be flowing through the shunt and 10 amps through the meter for 100 amps
total. If the assembly is to large fold the shunt over  3/8 in ROD TO FORM A
SPRING.  Note; drill stainless with lots of presure and slow speed. If the
drill heats the stainless it will harden  the stainless and the drill will
break.
     Robert   H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Thu, 13 May 2004 16:19:15 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Re: higher current ammeter sources
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Thu, 13 May 2004 16:56:09 -0600
 >
 > Original poster: davep-at-quik-dot-com
 >
 >
 >>> Shunts can be used on AC, as an alternative to current
 >>> transformers.
 >>
 >>> Yes, shunts are commonly used ON DC, they work fine on AC, also...
 >
 >> Of course, as long as they are calibrated for the frequency on which
 >> they're to be used or if that frequency is low enough that winding
 >> reactance doesn't count.
 > Shunts can be crafted so as to have no 'windings',
 > hence, minimal inductance.
 > Winding inductance of current transformers needs to be
 > considered, expecially with complex waveforms...
 >
 > best
 > dwp
 >
 >