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From: firstname.lastname@example.org (James Osborne)
Subject: Re: Power line filter for tread-mill?
Date: 16 Jan 2003 17:00:38 -0800
References: <3E2381DD.D64BD7E4@hotmail.com> <3E24D91A.FD0878E7@rica.net>
NNTP-Posting-Date: 17 Jan 2003 01:00:38 GMT
Most electronic equipment now days have Emi filters. You could check
out expensive surge protector devices that offer very elaborate noise
John Popelish wrote in message news:<3E24D91A.FD0878E7@rica.net>...
> Joe wrote:
> > I have a vauge impression that when certain devices are plugged
> > into a wall receptical (particularly variable speed AC motors in
> > laminar flow fume hoods) that the power wires inside the wall
> > receptacle box are wrapped a few times around a torroidal core
> > before being screwed onto the recepticle.
> > Are there any such wall recepticles or boxes that come pre-wired
> > with RFI filtering to prevent devices (such as fume hoods and tread-
> > mills) from injecting RFI noise back in the power line?
> > What devices or components can I wire directly into the breaker
> > panel to filter EMI / RFI?
> > Although I would like to see answers to the above questions, my
> > specific problem is the reduce the noise from a tread-mill from
> > being picked up be nearby electronic recording equipment.
> > thanks
> > Joe
> Sorry, the power panel is generally too far from the source of noise
> to help much. The wire between device and power panel has already
> acted as an effective antenna. The best place to put the filter is as
> close to the motor driver as possible. If not inside the tread mill,
> then, in an extension cord mounted box. The filters are prepackaged
> and available from almost every electronic distributor. Some big
> manufacturers are Corcom and Curtis Industries.
> Here is a link to the Corcom web site that has lots of selection info:
> Digikey carries Corcom and a brand I never saw before, PREO.
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