Copyright © 2002 by the Institute of Electrical and Electronics Engineers,
Inc.
3 Park Avenue
New York, New York 10016-5997 USA
All Rights Reserved.
This is an interpretation of C63.4-2000. Interpretations are issued to explain and clarify the intent of a standard and are not intended to constitute an alteration to the original standard or to supply consulting information. Permission is hereby granted to download and print one copy of this document. Individuals seeking permission to reproduce and/or distribute this document in its entirety or portions of this document must contact the IEEE Standard Department for the appropriate license. Use of the information contained in this document is at your own risk.
IEEE Standards Department
Copyrights and Permissions
445 Hoes Lane, P. O. Box 1331
Piscataway, New Jersey 08855-1331, USA
October 3, 2002
SH94908
Interpretation Number: 1
Topic: Radiated emission test site requirements above 1 GHz.
Relevant Clause: Subclause 5.5.
Section 5.5 states:
5.5 Radiated emission test site requirements above 1 GHz
There are currently 110 test site validation requirements above 1 GHz. However,
facilities suitable for measurements in the frequency range 30 MHz to 1000 MHz
are considered suitable for the frequency range 1 GHz to 40 CJHz, including
the presence of the reference groundplane (see ANSI C63. 7-1992).
NOTE-Additional site validation requirements above GHz are currently under study.
The laboratory in question states that any test site is acceptable as there
are no requirements for sites above 1 GHz-the laboratory has not shown any evidence
that the test site is acceptable for measurements over 1 GHz. American Association
for Laboratory for Accreditation (A2LA) interpretation of this subclause of
C63.4 is to show acceptable NSA from 30 -1000 MHz to show test site is acceptable
for measurements above 1 GHz, or, provide evidence that good engineering
judgment has been performed to reveal that the test site is acceptable for measurements
above 1 GHz. Typically, that would consist of a correlation between measurements
made on an OA TS and in the Semi-Anechoic chamber.
Please provide A2LA with an interpretation on this issue as to what is deemed
necessary to reveal evidence that a test site is acceptable for measurements
above 1 GHz.
1. At the present time, the committee cannot give any further guidance or an interpretation beyond that stated in 5.5 of C63.4.
2. Additional guidance for facilities used to measure emissions above 1 GHz
is available in the current editions of CISPR 16-1 & 16-2 and EN55011. See
5.12 of CISPR 16-1 (1999), 2.6.3 of CISPR 16-2 (1999) - Amendment 1 and Paragraphs
8.2 & 8.3 of EN55011:1998.
This information is provided without comment or endorsement.
3. Additional investigations on this topic are currently being worked on in C63 and in CISPR SC A.
Finally, as an editorial note - in this situation, the burden of proof for
demonstrating that the facility is appropriate for a particular test is then
left to the test laboratory. However, this information is also provided without
endorsement.
Copyright © 2002 IEEE. All rights reserved.