Pat,
May I suggest that you contact...
Steven Burger
(512) 657-6147
temconsult...@aol.com
He is a private consultant that could probably steer you in the right
direction ( no fee for directions, I guess ) .
Regards,
Reg Henry
QA / Electrical Engineering
FCC CE UL Compliance Engineer
Vicon Industries
89 Arkay Dr.
Hauppauge, New York 11788
*Tel: (631) 952-2288 x310
*Fax: (631) 951-2288
*Web: <http://www.vicon-cctv.com/>
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From: pat_law...@condordc.com [mailto:pat_law...@condordc.com]
Sent: Wednesday, November 17, 2004 2:19 PM
To: emc-p...@ieee.org
Subject: Using TEM cells for radiated emissions at 30MHz
Hi:
I was given some literature by management recently advertising the use of a
TEM cell for radiated emissions:
http://www.wavecontrol.com/index2004.php?idioma=2
Our people have the impression that a TEM cell small enough to fit on a
table-top could eliminate the need to go to the local OATS. I don't think
it's that simple, but I need more solid information.
The products I test are component power supplies, using CISPR 22 Class A &
Class B limits. Most of our emissions are in the range of 30-100MHz.
1) I've heard TEM cells need correlation to an OATS. Is this a one-time
correlation (like a calibration), or is it tied to the model being tested?
2) The dimensions of the TEM cell appear small compared to a wavelength at
30MHz. Does the issue of near-field and far-field zones still apply in a TEM
cell? If so, how do you correlate the two?
3) The product appears to have pyramid absorbers inside (no reverberation).
Does this mean the EUT needs to be repositioned several times during the test?
4) How do the TEM cell correlation factors and noise floor of the spectrum
analyzer interact? Do I need a certain maximum noise floor in order to make
measurements?
I guess I'm looking for a TEM cell tutorial, or maybe a book or paper titled
'TEM Cells For Dummies'. I wrote to the vendor, but they haven't responded.
On a slightly different note, has there been any progress for accepting
emissions measurements from reverberation chambers (IEC 61000-4-21)?
Thanks in advance,
Pat Lawler
EMC Engineer
Condor DC Power Supplies, Inc. --------
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