EMC Peak vs Average Detection: What's the Difference?

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SUMMARY

The discussion clarifies the differences between peak detection and average detection in electromagnetic compatibility (EMC) testing, specifically referencing military standards like MIL-461 and consumer standards. Military EMC standards require peak detection, which is designed to capture the highest levels of RF noise, while consumer standards typically utilize average detection. The conversation emphasizes that peak detection serves as an effective preliminary screening method for emissions, indicating that if a product passes peak detection, it is likely to meet average detection requirements as well.

PREREQUISITES
  • Understanding of MIL-461 military EMC standards
  • Familiarity with spectrum analyzer configurations
  • Knowledge of RF noise measurement techniques
  • Experience with EMC testing methodologies
NEXT STEPS
  • Research the specifics of MIL-461 peak detection requirements
  • Learn about spectrum analyzer settings for both peak and average detection
  • Explore RF noise mitigation techniques for high emission frequencies
  • Study the differences in EMC testing between military and consumer standards
USEFUL FOR

Engineers, EMC testers, and product developers involved in compliance testing for military and consumer electronics will benefit from this discussion.

senmeis
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Hi,

I’ve read military EMC standard (such as MIL 461) requires peak detection while consumer standard requiers average detection. Does it mean the peak detection is stricter than the average one?
 
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No, but the peaks create the top RF noise.
 
senmeis said:
Hi,

I’ve read military EMC standard (such as MIL 461) requires peak detection while consumer standard requiers average detection. Does it mean the peak detection is stricter than the average one?
But... In addition to different spectrum analyzer configurations, the limits required are also different. So whether you meet your applicable standard can depend both on the sort of emissions you have, the test methods, and the limits.

However, in my experience (mostly commercial products), peak detection is a fairly good "worst case" screening setup. It's a quick and easy way to check. If you pass the levels required for averaging detectors with your peak detector, your usually in good shape. Then you can focus your work on the high emission frequencies you see. The average detectors will seldom give more signal than peak detectors.
 
Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?

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