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From: Daniel Haude
Subject: Re: ceramic caps across the diodes on a bridge rectifier
Date: 25 Sep 2002 11:29:32 GMT
Organization: stoptrick: animated films
References: <email@example.com> <firstname.lastname@example.org>
NNTP-Posting-Date: 25 Sep 2002 11:29:32 GMT
User-Agent: slrn/0.9.7.4 (Linux)
On 23 Sep 2002 05:03:25 -0700,
Win Hill wrote
in Msg. <email@example.com>
| I often take sensitive measurements using quick lashups on my bench,
| without sheilding. The signal-averaging capability of digital scopes
| makes this a practical time-saving shortcut. However, one interesting
| result is a strong sharp spike I often see. It's usually only a few
| us long, and occurs at 120Hz in a very steady position with respect to
| ac-line cycles. It looks just like the leakage-inductance flyback spike
| I have observed in various instruments... I've turned off various things
| on my bench, but haven't found the source.
We've got it in all our labs, even on a battery-operated scope when
everything is turned off and the DUT is on batteries, too. It probably
couples inductively from the power lines that run throughout the
building. Possibly it could also capacitively couple into any electronic
equipment via the power supply.
"The obvious mathematical breakthrough would be development of an easy
way to factor large prime numbers." -- Bill Gates, "The Road Ahead"
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