Well, some of the set-ups I've seen appear to accept violent mismatches,
so concern about the cables may not be misplaced. But I still think that
an in-depth study of the discharge path, from source back to source, is
needed.
What is a 'reasonable waveform definition'? Do you mean a precise
definition of a realistic waveform? I think that IEC 61000-4-2 has a
precise definition, but I have no idea whether the waveform is
realistic, even less whether is it a reasonable 'average' of a range of
possible waveforms. But we must note that it is a specification to be
met under verification test conditions: it *does not* claim to be the
waveform that actually occurs during any specific immunity test. It
could not possibly claim that.
Best wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates www.woodjohn.uk
Rayleigh, Essex UK
On 2019-10-15 20:06, doug emcesd.com wrote:
Well said, Derek!
I am always amazed that EMC people worry about the measurement
uncertainty of the coax cable that connects the target to the scope
yet ignore factors, like lack of reasonable waveform definition, that
have orders of magnitude more effect on the EUT.
Doug
Sent from my iPhone
IPhone: 408-858-4528
Office: 702-570-6108
Email: [email protected]
Website: http://dsmith.org
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