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From: John Popelish
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X-Mailer: Mozilla 4.7 [en] (Win98; U)
Subject: Re: Power line filter for tread-mill?
Date: Tue, 14 Jan 2003 03:42:36 GMT
NNTP-Posting-Date: Mon, 13 Jan 2003 22:42:36 EST
> 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.
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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