IEC SC77A, responsible for IEC 61000-3-2- and -12 and IEC 61000-4-7, is
reviewing the method of measuring the low-frequency (100 Hz to 2 kHz or
120 Hz to 2.4 kHz) conducted emissions into the mains supply.
It wasn't actually intended to review the method of measurement, but to
resolve certain issues with specific types of product that do not meet
emission limits but are not known to cause EMI incidents. But it has
been found that the method of measurement may in some cases report
emissions, at significant levels, that do not in fact exist.
I would like to discuss these issues in more detail with people who work
with Multi Cycle Synchronous Control for energy regulation and Variable
(or Adjustable) Speed Drives. While we have experts on the latter in the
specialist group doing the work, we do not have an MCSC expert.
I suggest you contact me off-list if you can help. But any exciting news
can be reported on this list.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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