In message
<62BC578358ACC449B01A530DF004D4B401040CF1DBEA@MBXVS03.hosting01.active24.
com>, dated Wed, 29 Feb 2012, amund <[email protected]> writes:
In IEC60533 ("Electrical and electronic installation in ships - EMC")
there is a requirement for conducted emission on Power lines and I/O
signal /control lines.
In our case, potenial conducted noise on our signal lines have to pass
through a number of PCBs, DC/DC convertes and AC/DC supply, before the
noise will enter the ship AC network.
I have a problem to see why we should measure direct on the signal
line, shouldn't we test on the AC instead?
You need to measure conducted emissions on the signal/control lines
because they may be long enough to radiate (due to common-mode signals
or noise) in the frequency range below 30 MHz, the normal lower limit
for radiated emission tests.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
If 'QWERTY' is an English keyboard, what language is 'WYSIWYG' for?
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