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Publication Number: 714737 Rule Parts:  Publication Date: 11/30/2010
Keyword: 15B, Average Detector for Unintentional Radiator

First Category: Administrative Requirements
Second Category: Measurement Procedures

Question:   What average detector should be used to measure radiated emissions from an unintentional radiator?



Answer:  
The radiated emission limits for unintentional radiators are specified in Section 15.109. There are both average and peak limits on radiated emissions above 1 GHz and Section 15.35 specifies the measurement detector function and bandwidth to be used when performing the required measurements.
 
There are a number of different types of average detectors available for performing EMI measurements on the market today. Above 1 GHz, CISPR 16-1-1 defines two modes of the average detector - linear and logarithmic. For radiated emission measurements at frequencies above 1 GHz, the appropriate average detector is the linear average detector as defined in Clause 6 of CISPR 16-1-1.
 
See CISPR interpretation sheet SC CIS/I/Publication CISPR 22 (2008), Sixth Edition/I-SH 01.

 



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