Measuring Filter Insertion Losses Under Rated Load Conditions at Extended Frequencies

The currently accepted methods of measuring interference filter performance have been a target of criticism for sometime. Since the adoption of Military Standard MIL STD-220A in 1959, relatively little workhas been done to extend the range of performance. Recently, however, the picture has changed, and is more favorable. Experimentation and refinements thereof are the basis for this report. The methods to be described in measuring filter performance under actual operating conditions provide a new tool not offered by present techniques. The advantages outweigh the disadvantages, and are promising enough to warrant further investigation.