EMI Precompliance Testing Saves Time and Money
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Electromagnetic interference (EMI) compliance testing presents the risk of a costly bottlneck, so many companies now rely on precompliance testing to find and fix problems earlier in the product development process.
Precompliance versus full compliance
Full compliance measurements require the use of a receiver that meets the requirements set forth in CISPR16-1-1 from the International Special Committee on Radio Interference (CISPR) for commercial compliance or MIL-STD 461 for military standards. Also required are a qualified open area test site or semi-anechoic chamber and an antenna tower and turntable to maximize signals from the device under test (DUT). Great effort is taken to get the best accuracy and repeatability, and the required facilities and equipment can be quite expensive.
At a fraction of the cost, precompliance measurements offer an approximation of the EMI performance of the DUT. With attention to detail in such factors as ensuring a good ground plane and minimizing the number of reflective objects, precompliance measurements can provide the insight needed to resolve design issues before heading into full compliance testing.