How to interpret EMC testing results?

[gary_feesher]

Hello all,

I am working on a project where we need to perform EMC testing on our device to meet regulatory compliance. I was wondering if you could help me to interpret the meaning of the results; and what I'm exactly reading in the results.

The test results which I have are measuring the following:

• Frequency (ranging from 100kHz up to 2.845MHz).
• The peak dBuV at each of these frequencies.
• The average of the peak
• The average difference
• The quasi-peak
• The quasi-peak difference

And finally, based on this data; it determines if it is a Pass or a Fail.

My questions are as follows:

• What do these measurements mean with respect to my device's ability to withstand EMC testing?
• What is the practical application of EMC testing and why is it so important?
• If my device has an EMC "Fail", what are some things in the circuit which need to be re-designed in order to meet EMC requirements?

 

[ktr]

EMC test is required to determine that your device should have no effect on the other equipment around. Like placing a Transciever in a plane, where there are tens of other equipment around. You need to be sure that your equipment would not disrupt something else.

Peak-to-Average ratio is a thing with your waveform, consider your duty cycle is sth like %10; however your peak's are really big. That would mean at your peaks, probability of effecting other equipment will increase. Basic methods are EMC filters, which can vary from simple coils to metal enclosures depending on your application(Frequency of operation)