The FCC measuring distance for radiated emissions in that freq range is 300
meters and 30 meters.
As usual, other measuring distances are allowed and corrections made to either
move the limit to the measured distance or move measurement to the limit
distance. There are certain advantages hidden within the correction process.
- Bill
Indecision may or may not be the problem.
--- On Thu, 10/16/08, Amund Westin <am...@westin-emission.no> wrote:
From: Amund Westin <am...@westin-emission.no>
Subject: RE: IEC 60945 & computer equipment onboard ships
To: emc-p...@ieee.org
Date: Thursday, October 16, 2008, 11:11 AM
I thought that the default measuring distance was 3 meter, even in the
150kHz
– 30MHz band.
Fra: emc-p...@ieee.org [mailto:emc-p...@ieee.org] På vegne av Gert
Gremmen
Sendt: 16. oktober 2008 15:44
Til: emc-p...@ieee.org
Emne: RE: IEC 60945 & computer equipment onboard ships
The limit of 24 dBuV QP should be measured with a bandwidth of 9 kHz,
a combination that is not too common (I mean QP and 9 kHz BW)in
measuring
receivers but the newest.
Alternately 30 dBuV peak may be applied, and then 9 (10) kHz is a normal
setting.
60945 also requires 1-2 GHz emission testing with a BW of 120 kHz, where
normal
EMC standards require 1 MHz bandwidth.
As a last pitfall, magnetic emissions are required from 150 KHz to 30
MHz,
this
requires a 60 cm loop. Fortunately (!!?!!) the standard has no test
set-up
requirements for this test set up, nor test distance is specified.
BTW if someone has some reference sources to this rather old
test method (60 cm loop: history, calibration or other), I would be
obliged
if he would share this with the list.
Regards,
Ing. Gert Gremmen
--------------------------------------
ce-test, qualified testing bv
Van: emc-p...@ieee.org [mailto:emc-p...@ieee.org] Namens Amund Westin
Verzonden: Thursday, October 16, 2008 2:45 PM
Aan: emc-p...@ieee.org
Onderwerp: RE: IEC 60945 & computer equipment onboard ships
From IEC60945 scope:
This standard specifies minimum performance requirements, methods of
testing
and required test results for general requirements which can be applied to
those characteristics common to all equipment described hereunder:
c) for EMC only, all other bridge-mounted equipment, equipment in close
proximity to receiving antennas, and equipment capable of interfering with
safe navigation of the ship and with radio-communications (see IMO Resolution
A.813).
So, ITE placed on bridge is basically covered by the standard.
Be aware that radiated emission in the band 156-165MHz has a limit of
24dBuV/m. A lot of equipment fails at that point.
#Amund
Fra: emc-p...@ieee.org [mailto:emc-p...@ieee.org] På vegne av
brian_mcauli...@dell.com
Sendt: 16. oktober 2008 13:09
Til: emc-p...@ieee.org
Emne: IEC 60945 & computer equipment onboard ships
Does anybody have any experience with EMC testing to IEC 60945 ?
The scope of the standard mentions that EMC requirements apply to ‘all
other equipment’ (ie non-navigational or radio communication equipment).
Does this cover computer equipment and if so is 60945 more onerous than CISPR
22/24 used for ITE ?
The scope also mentions that radio equipment and navigation equipment be
type-approved by national administrations . I presume that computing equipment
not part of radio/navigation equipment does not require type approval but
would be interested in hearing your thoughts on this also.
Thanks for your help
Brian McAuliffe
Dell Products Europe
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