Development of international standard takes a time. Modification takes
even longer. CISPR approval criteria are at least 67% in favor and no
more than 25% against votes by participating National Committees.
CISPR Sub-Committee B developed Amendment to CISPR 11 to allow
measurement at a closer distance. It is in translation process to French
and will likely be published early next year. CENELEC could adopt the
same change to EN 55011 even sooner.
The first paragraph of Clause 7.1.3 is modified as follows:
The separation between the antenna and the equipment under test shall be
as specified in Clause 5. If the field strength measurement at the
specified distance cannot be made because of high ambient noise levels
(see Sub-Clause 6.1) or any other reason, measurement may be made at a
closer distance. When this is done, the test report shall record the
distance and the circumstances of the measurement. For the test site
measurements, an inverse proportionality factor of 20 dB per decade
shall be used to normalize the measured data to the specified distance
for determining compliance. Care should be taken in measurement of large
test unit at 3 m at frequency near 30 MHz due to near field effects.
Regards,
Mirko Matejic
CISPR SC B member
-----Original Message-----
From: [email protected]
[SMTP:[email protected]]
Sent: Wednesday, October 14, 1998 10:36 AM
To: [email protected]
Subject: Re: EN55011:1998, Antenna Distance...
Hi Eric,
You made very good points about the problems in both new
and current
EN55011. Especially the 30 meter issue that you brought
up last June. The
problem is how to establish an effective communication
channel to TC110 of
CENELEC. Can our colleagues in Europe help?
Best Regards,
Barry Ma
______________________________________________
From: "Eric Lifsey" <[email protected]>, on
10/13/98 3:49 PM:
..................
Legacy Problems in Current and New Editions:
- Class A explicitly calls for 30 meter antenna
distance.
- Class B explicitly calls for 10 meter antenna
distance.
...........................
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