Seems to me that 6.4.1 . . . ignores the possibility that additive
emissions may depend on not only the source(s), but the mechanism and
point(s) of egress. I can envision several modules producing like emissions
which are then coupled into a back-plane where there may be common mode
coupling not at work with only one module in place.
Half a thought - 1 cent worth
_\\|//_
(' O-O ')
ooO-(_)-Ooo
Mark Carter
AM Communications, Inc.
[email protected] <mailto:[email protected]>
Voice: 215-538-8710
Fax: 215-538-8779
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Friday, July 28, 2000 3:29 PM
To: [email protected]
Subject: Return: Rack populating?
I began this thread by asking if a rack passed emissions profiling with 1
unit, is it necessary to fully populate it with (say) 4 units to demonstrate
emissions compliance. I've located the reference I remembered
reading...CISPR 11:1997+A1:1999 (of all things!)
Under 6.4.1:
'A system which contains a number of identical equipments, but has been
evaluated using only one of those equipments, does not require further
evaluation if the initial evaluation was satisfactory' followed by a NOTE
which says that emissions from identical modules are not additive.
Any comments?
In practice, I'm inclined to test to the full installation anyway, since I
generally 'learn' so much about the integrated system during compliance
testing...
WmFlanigan
Standards Engineer
Ameritherm Inc
Scottsville, NY
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