Bob,
For intentional radiators, the conducted emissions rules (Part
15.207(d)) are somewhat different.
" (d) Measurements to demonstrate compliance with the conducted
limits
are not required for devices which only employ battery power for
operation and which do not operate from the AC power lines or contain
provisions for operation while connected to the AC power lines. Devices
that include, or make provisions for, the use of battery chargers which
permit operating while charging, AC adapters or battery eliminators or
that connect to the AC power lines indirectly, obtainig their power
through another device which is connected to the AC power lines, shall
be tested to demonstrate compliance with the conducted limits."
The TCB requested conducted emissions test results with the DC supply
normally used.
.
Honeywell
David W. Sterner
Quality Assurance Engineering
Security & Custom Electronics
165 Eileen Way
P.O. Box 9035
Syosset, NY 11791
Phone: (516) 921-6704 x6970
Fax # (516) 364-6953
[email protected]
<http://www.honeywell.com>
From: [email protected] [mailto:[email protected]]On Behalf Of
[email protected]
Sent: Monday, April 10, 2006 7:46 AM
To: [email protected]
Subject: Re: Fw: FCC equipment authorization: Have RFID devices
operating @ 13.56 MHz been exempted from conducted emission testing?
15.107 (d) and 15.207 (c) are talking about AC line power and these
sections were clarified in the 2004 edition and it fully reads:
"Measurements to demonstrate compliance with the conducted limits are
not
required for devices which only employ battery power for operation and
which do not operate from the AC power lines or contain provisions for
operation while connected to the AC power lines. Devices that include,
or
make provisions for, the use of battery chargers, AC adaptors or battery
eliminators or that connect to the AC power lines indirectly, obtaining
their power through another device which is connected to the AC power
lines, shall be tested to demonstrate compliance with the conducted
limits."
According to the FCC, the AC line conducted emission test is necessary
for
equipment that obtain their AC power through another piece of equipment.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
=========================
Kbalasubramanian@
scmmicro.co.in
Sent by:
To
[email protected] John Woodgate
<[email protected]>
cc
04/10/2006 05:48 [email protected]
AM
Subject
Re: Fw: FCC equipment
authorization: Have RFID devices
operating @ 13.56 MHz been
exempted
from conducted emission testing?
Dear John,
Thanks for your expert opinion and guidance. After posting my
previous message I browsed through FCC Part 15 and found the below.
As per section 15.107 (d) and section 15.207 (c), "devices obtaining
their
power through another device which is connected to the AC power lines,
shall be tested to demonstrate compliance with the conducted limits".
If my understanding is correct the physical access control reader
which draws power from the physical access control panel also should
prove
compliance to conducted emissions tests. But the report listed in the
FCC
website which I hope would have been reviewed by a TCB indicates the
otherway.......................
Sincerely
K.Balasubramanian
Project Leader - Hardware.
John Woodgate
<[email protected]
o.uk>
To
Sent by: [email protected]
[email protected]
cc
Subject
04/10/2006 03:35 Re: Fw: FCC equipment
PM authorization: Have RFID devices
operating @ 13.56 MHz been
exempted
from conducted emission testing?
In message
<ofc16ca941.1e2334c5-on6525714c.003142c5-6525714c.00322...@scmmicro.co.i
n
>, dated Mon, 10 Apr 2006, [email protected] writes
>Thanks for the reply. So if a device is not drawing power from the a.c.
>mains it is exempted from line conducted emissions test.
> Similarly USB devices (such as USB mouse, USB keyboard, USB smart
>card reader etc.) which are drawing power from the USB port of the PC
>also are exempted from the line conducted emissions testing.
> Is my understanding correct?
It may be correct for FCC: the requirements in Europe are rather
different, and too complicated to explain here. See clause 9 of ***the
latest edition of*** EN 55022.
--
OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk
2006 is YMMVI- Your mileage may vary immensely.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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