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- Path: sparky!uunet!math.fu-berlin.de!news.netmbx.de!Germany.EU.net!mcsun!uknet!edcastle!cam
- From: cam@castle.ed.ac.uk (Chris Malcolm)
- Newsgroups: sci.electronics
- Subject: Re: Electric Blankets and Sterility
- Keywords: Electric Blankets Sterility
- Message-ID: <25008@castle.ed.ac.uk>
- Date: 19 Aug 92 23:56:46 GMT
- References: <1992Aug19.170303.15912@uniwa.uwa.edu.au> <1992Aug19.123408.11089@doug.cae.wisc.edu>
- Organization: Edinburgh University
- Lines: 22
-
- In article <1992Aug19.123408.11089@doug.cae.wisc.edu> kolstad@cae.wisc.edu (Joel Kolstad) writes:
- >In article <1992Aug19.170303.15912@uniwa.uwa.edu.au> gude@uniwa.uwa.edu.au (David J W Emrich) writes:
-
- >>3. Is there any field emitted when the blanket is switched off?
-
- >For all intents and purposes, no. There's some very negligible field
- >left, but you'd be hard pressed to even measure it when the heating element is
- >off.
-
- It's very easy to measure the field left when the blanket is switched
- off. The still-connected earth or neutral line acts as a large aerial
- lying alonside the mains, and picks up a great deal of main hum and
- other interference. If the switch isolates all lines there is still
- capacitive coupling. And if the plug is pulled out the wall the
- blanket still acts as an aerial.
-
- All of this is easily measured. It's another question whether it hurts
- people.
- --
- Chris Malcolm cam@uk.ac.ed.aifh +44 (0)31 650 3085
- Department of Artificial Intelligence, Edinburgh University
- 5 Forrest Hill, Edinburgh, EH1 2QL, UK DoD #205
-