| EMC Standards Activity |
by Don Heirman, Associate EditorAdvance Look at ANSI C63.4-2000 |
Don Heirman is a member of ANSI-ASC C63 and its editing committee for C63.4-2000.
Well at long last the next edition of ANSI C63.4 is about to hit the street. The final recirculation ballot (for draft 4.1) to nail down consensus is well underway. Here are some of the principle changes/additions that will be contained therein:
Addition of Wideband TEM devices as an alternate to open area testing for a limited set of products based on their size and correlation with OATS tests.
Clarification of final radiated emission testing, i.e. "....full frequency spectrum... shall be investigated. ...... rotated 360 degrees, ...antenna height scanned between 1 and 4 m, .....antenna rotated .. for both...polarizations. During the full frequency spectrum investigation, particular focus should be made on those frequencies found in exploratory testing that were used to find the final test configuration, mode of operation, and arrangement... This full spectrum test constitutes the compliance measurement.
Addition of test set-ups for tabletop EUT systems which are comprised of more than two peripherals.
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Don
Heirman, lead instructor, welcomes students to the ANSI-ASC C63.4 seminar held
over two days prior to the 2000 IEEE International Symposium on EMC in Washington,
DC. | During
the C63.4 seminar, students were divided into teams to solve "workshop problems"
involving the standard. The teams then presented their respective problems and
solutions to the entire class under the watchful gaze of instructor Don Heirman
(far left). |
Clarification on location of power adapters (battery eliminator) conducted emission testing; clarification on the use of "extension cords" attached to the LISN during LISN calibration procedures.
New test setups for floor standing EUTs using overhead cable trays and suspended ceilings for cable raceways; new test set-up for combination floor standing and tabletop EUT systems.
Addition of reference to ISO Guide 25-1990 when "any requirement concerning statements of uncertainty of the measurement results" are specified by voluntary or regulatory requirements.
The draft document can be ordered by contacting Tricia Gerdon on p.gerdon@ieee.org. The final standard is expected to be issued before the end of the year. No substantive changes are expected from that in draft 4.1. EMC