John,
I'm still digesting the thread regarding variability of
that test.
Here, I've measured effective impedance of the lines
anywhere from 0.003 to 0.3 ohms. Once made a big
difference in ground leakage test a for hospital product.
The US govt paid for a study finding the "expected"
impedance of AC mains over the spectrum of fundamental up
to 1 MHz for residential, simple industrial, and medium
sized industrial. Although very thick, copy makes
interesting reading.
There should be some way to predict the maximum "envelope"
of the harmonics given a perturbation to the impedance.
Or, simply, sweep the impedance over an expected range.
Variability always suggests lack of controls. After all,
science is in the business of verifiable/repeatable
experimentation. Forgot, EMC is not a science. :-)
- Robert -
PS let us know if you don't get this one.
On Thu, 21 Jul 2005 07:31:27 +0100
John Woodgate <[email protected]> wrote:
> I didn't receive any messages yesterday, so I wonder if
> there is a transmission problem.
> --
> Regards, John Woodgate, OOO - Own Opinions Only.
> Deadlines are 90% of deadliness.
> http://www.jmwa.demon.co.uk Also see
> http://www.isce.org.uk
>
>
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