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A Low Cost Sniff Testing Method for RF/MW Products
Keywords: sniff testing, low cost, EMI compliance
Complying with the different EMC standards and regulations for RF or microwave products that are set by the FCC or European EMC Directive is not difficult, if one follows certain criteria regarding designing, wiring, grounding and shielding, and usage of EMI suppression components. Furthermore, the necessary EMI measurements should not be costly for those manufacturers who don't have an EMC lab in house. This paper explains a sniff testing method to preliminarily categorize a product in EMC perspective, if no EMC lab exists in house. This method has also inspired by following the EMC regulations. Once a set sniff testing of an RF/MW product is completed, the product can be sent out to an EMC lab for the final measurements. This will eliminate the repetitive EMC lab measurements and save time and money. The method is based on performing the DUT's testing at a much closer distance than what is necessary by the regulations, which would require a large EMC lab, and then using the inverse proportionality factor of 20 dB per decade to scale the measurement results for the required distance. The signal is at the highest level when testing at an in-band frequency. Considering some level of low ambient noise in the test room, the measured emission will be higher than the true and plain emission from the DUT. This would lead that the product should be EMC compliant when tested in an EMC lab. Test equipment, test procedures, and a sample testing results are given and discussed.
Hakan P. Partal, Professor & RF Design Engineer
Syracuse University & Yildiz Technical University
Syracuse, NY

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