If the composite device can radiate all transmitters simultaneously, I
believe you will find that they will need to be tested simultaneously.  The
exposure limit standards indicate the sum of all exposure sources, though I
am not sure that you will find that the measurement methodology for a
particular phantom is set up for simultaneous measurements.  You'll need to
work this through with your lab of choice. 

A fall back position might be to measure each separately and then
numerically sum the results per the calling standards.

Good luck,

Don Umbdenstock
Manager Compliance Engineering
 
Tyco Safety Products / Sensormatic
6600 Congress Avenue
Boca Raton, FL  33487 USA
561.912.6440
[email protected]
 


From: Carpentier Kristiaan [mailto:[email protected]] 
Sent: Tuesday, October 18, 2005 10:49 AM
To: EMC-PSTC List
Subject: EMF testing multiple radios

Hi group,

A product contains multiple radio's at the same and/or different frequencies
(ex. WLAN & Bluetooth (2.4GHz) & WLAN 5GHz.
Do all radios have to be activated (transmitting) simultaneously to measure
EMF, SAR at once or shall each radio be tested individually? Is this maybe
country dependent?

Best regards,
 
Kris Carpentier
Regulatory & Approvals

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