Re: Wattmeter

• To: tesla-at-pupman-dot-com
• Subject: Re: Wattmeter
• From: Jim Lux <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Thu, 21 Jan 1999 17:04:26 -0700
• Approved: twf-at-verinet-dot-com

T
> Terry, Steve, ALL
> 
> Sorry about the miscommunication..  :^C
> 
> 
> 1.  Wind a 50:1 current transformer (CT) on ferrite core.  Pass
>     main power path =insulated= conductor through opening with
>     additional polyethylene tubing insulation.  This will feed
>     a shunt of approximately 12 milliohms.

Why not use one of those Honeywell hall effect current sensors? They
have fairly good bandwidth, a hole through the middle for your wire, and
produce a buffered analog output. Saves winding coils and toroids, etc. 
They were about $20 last time I checked..



-- 
Jim Lux                               Jet Propulsion Laboratory
ofc: 818/354-2075     114-B16         Mail Stop 161-213
lab: 818/354-2954     161-110         4800 Oak Grove Drive
fax: 818/393-6875                     Pasadena CA 91109

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