If your device has a transformer on the AC mains, just insert your pl=
ug=20
loosely into the AC socket and wiggle it side to side so it=20
makes/breaks contact with the mains voltage. Very similar to the test
you do, also very "real-world".

You'll get some *very* interesting spikes and HF noise on the=20
transformer secondary. I have used this "bench test" on virtually eve=
ry
consumer electronics device I've designed and find that if it passes=
=20
this test and doesn't lockup or exhibit weird beahvior, it almost=
=20
always has no other transient related problems in regulatory agency=
=20
testing.

I've found that once any line noise gets through to a transformer=
=20
secondary, it's virtually impossible to get rid of.

Matt Pobursky=20
Maximum Performance Systems=20

On Thu, 7 Nov 2002 09:52:48 -0600, llile@SALTONUSA.COM wrote:=20

Do any of you have any standard torture tests that test your products=
=20
against common levels of noise and spikes? =A0I am not interested in=
=20
formal EMC testing at a lab, just something that can be homebrewed.
We have a machine we use that consists of a lamp dimmer with a 100 wa=
tt=20
lamp, a couple of heavy duty contactors that clack each other on and=
=20
off, and an electric mixer connected to one of the clacking relays=
=20
going rrumm rrrumm rrumm. =A0 It is an extremely crude machine, but=
=20
pretty effective at making noise. =A0I am wondering if anyone else do=
es=20
this sort of testing.

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