Of course this is a good thing. But it also means that in order to minimize their EMI characteristics and pass official EMI certification testing, many companies must spend a lot of manpower and resources on product design and testing. The bad news is that even with good design principles, high quality components, and careful product characterization, EMI failures can still be affected if the test does not go well at all stages when performing compliance testing. Product release schedule.
Usually in order to avoid such a situation, the company will do some "pre-conformance" measurements during the design and prototype establishment phase. A better approach is to identify and fix potential EMI issues before the product is sent out for compliance testing.
Of course, most companies' laboratories do not have the test chamber conditions needed to make absolute EMI measurements. The good news is that it is completely feasible to identify and resolve EMI problems without copying test room conditions. Some of the techniques discussed in this article can help you reduce the risk of a product failing in the final complete EMC conformance assessment in the test room. This article also gives an example of determining signal characteristics and consistency in order to find an EMI source.
Figure 1: The changing voltage and current in the signal produces an electromagnetic field.
Understanding the EMI report
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