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Correlation between EMC Measuring rooms

Correlation between EMC Measuring rooms

(OP)
Hello,

Can you give me some interessting information about the correlation between OATS, Semi-Anechoïc rooms, Full-Anechoïc rooms, Reverberation rooms, GTEM cel and mode-stirrers?

Thanks.


Best regards,
Dieter

RE: Correlation between EMC Measuring rooms

A respectfull sugestion. Not to use abreviations or trade marks insted of the complete full names, then I wil do my best to help you. AIR

RE: Correlation between EMC Measuring rooms

Have a look at the following draft European standard prEN50147-3 which will form the basis of the use of 3m sites within fully anechoich rooms. The primary author is Martin Alexander at the National Physical Laboratory - he may send you a copy.

RE: Correlation between EMC Measuring rooms

A semi-anechoic room will have excellent correlation to an OATS site assuming adequate geometric size of the semi-anechoic room and effective absorber material over the frequency range of comparison.  A fully anechoic room also has absorber on the floor, so the theoretical path loss for a radiated signal will be several dB higher than a semi-anechoic room.  This makes is unsuitable for FCC or EN RF emissions tests, but well suited for radiated susceptibility tests.

Reverberation chambers are also known as mode stirred rooms.  They are fundamentally different from OATS and anechoic rooms in that they attempt to maximize the effects of reflections.  They are particularyly well suited for high field intensity RF immunity tests and shielding efectiveness tests.  There may be poor correlation to OATS for emissions tests.  Proper use requires complex characterization technique.

GTEM chambers may correlate well with OATS, but have significant restrictions on the size of the test item.  They are also useful for immunity tests and typically require less RF power than anechoic chambers.  May be difficult to do horizontal e-field polarization for some items.

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