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From: "Dave VanHorn"
References: <firstname.lastname@example.org> <email@example.com>
Subject: Re: ceramic caps across the diodes on a bridge rectifier
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Date: Mon, 23 Sep 2002 15:23:34 GMT
> 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.
I've found a lot of interesting things, triggering the scope on power input
or switcher gate, and poking around in the analog bits. It's an
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