The US does the same thing. They treat spurious energy from a transmitter
differently than from digital circuitry. I don't fully understand this
except that the harmonics from a transmitter probably have a bit more power
in them than digital stuff and they have a built in antenna for them. This
generally involves multi-functional equipment. An example would be a
passport reader that reads RFID chips in passports as well as the UV inks
and IR on passports. We look at the emissions with and without the RFID
reader active while having the other functions active and treat the
energies we see as belonging to the transmitter or to the other "digital"
functions. Yes, the Class A "digital" stuff would be acceptable in a
non-domestic environment for an intentional transmitter in Canada.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=======================================================
From: John McAuley <john.mcau...@cei.ie>
To: "'emc-p...@ieee.org'" <emc-p...@ieee.org>
Date: 11/01/2009 02:00 PM
Subject: Industry Canada RSS Gen Class A/Class B
Sent by: <emc-p...@ieee.org>
Dear Group
I have a query regarding spurious emissions from a transmitter device. The
product is not destined a domestic/residential environment. The system
falls under Category II and RSS 310/RSS Gen. RSS 310 specifies Class B type
limits for spurious emissions.
However, in RSS-Gen it states:
"7.1.6 Digital Circuits
If the device contains digital circuitry that is not directly associated
with the radio transmitter, the device shall also have to comply with
ICES-003, Class A or B as appropriate...."
In this case the emissions are from digital circuitry in the same enclosure
as the radio transmitter but not in the same module. Can anyone advise of
the general practice in this regard for Canadian compliance?
Are Class A unintended emissions generally acceptable in a
non-domestic/residential environment for an intentional transmitter in
Canada?
Many Thanks
John McAuley
www.cei.ie
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