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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?

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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