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One of the basic controls of electromagnetic interference (EMI) is a power line filter. The performance of a filter depends on various factors, such as, voltage and current ratings, environmental conditions, mechanical considerations and the like. Filter performance is required to be evaluated in full load conditions rather than no load conditions, since the former can predict the actual loss levels, which the latter cannot. Another factor, which dominates filter performance, is the type of load to which the filter will be exposed in real practice. In this paper an attempt has been made to show that different types of load may result in different loss levels for the filter over the desired frequency spectrum. Comparison of loss levels obtained during the test and also during actual use has also been dealt with.