Hello all,
I appreciate everyone's responses on this. Some comments raise another
question.
Since there needs to be a ground plane to meet NSA, but an absorber lined
floor is desirable for immunity testing, how is this normally resolved?
The only solution I can think of would be to make the absorber material
removable. In the case where ferrite tiles are used, how is this done without
breaking them each time they are moved?
Would the ground plane need to be exposed for the complete floor, or just
sections? NSA data would probably tell how much ground plane needs to be
there, but I was wondering if there are any industry standard practices.
Thanks,
Tim Pierce
In a message dated 7/30/2008 12:24:24 PM Pacific Daylight Time,
[email protected] writes:
Both answers are correct, but also the term Fully Anechoic Chamber
raises a
flag. The FCC does not allow the use of fully anechoic chambers for emissions
testing (30MHz - 1000MHz). Reference ANSI C63.4(2003) Section 5.
CISPR 22 does not allow the use of fully anechoic chambers (Section
10.4) &
(CISPR 16.1.4)
All test sites must meet vertical and horizontal theoretical Site
Attenuation.
Bill Stumpf
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of Pettit,
Ghery
Sent: Wednesday, July 30, 2008 2:06 PM
To: Rudd, Adam; [email protected]; [email protected]
Subject: RE: Class A antenna distance
Note that the allowance for shorter measurement distances in CISPR 22
is for
small devices, too. And, as noted, is limited to Class B devices. Plus, some
regulators do not allow this option to be used and insist on 10 meter data.
Ghery Pettit
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of Rudd,
Adam
Sent: Wednesday, July 30, 2008 11:59 AM
To: [email protected]; [email protected]
Subject: RE: Class A antenna distance
47CFR 15.31(f)(1) allows measurements at distances other than specified
and
details the extrapolation factor.
http://edocket.access.gpo.gov/cfr_2007/octqtr/47cfr15.31.htm
EN 55022 Section 10.2.1 has a note that specifically makes an allowance
for
Class B devices to be measured at 3m. I tend to think the detail of Class B
being included and Class A being omitted from the note has significance.
Best Regards,
Adam Rudd
Engineer (EMC)
NCR Corporation, RHSS
Duluth, GA
(770) 495-2825
________________________________
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Wednesday, July 30, 2008 2:26 PM
To: [email protected]
Subject: (no subject)
Dear members,
I have a question on the use of a 3 meter fully anechoic chamber.
Can this 3 meter chamber be used to qualify a product for FCC or CISPR
class
A, since the required test distance is 10 meter?
Please provide any reference to paragraphs in the standards. Your
responses
are appreciated.
Thanks,
Timothy A. Pierce
Tap Engineering, Inc.
________________________________
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