17Matrix Applications: A Continuation of Chapter 16
The first step is to find the filter type needed for the application.
If a test specification is in place, this tells the EMI filter designer what specifications the filter must meet, such as MIL-STD-461, CISPR, FCC, or some other. The specification for either the capacitance to ground or the maximum current on the ground lead varies considerably, depending on the function of the equipment. Medical specifications are the hardest to meet, especially if the equipment is attached to the patient. Sometimes the limit is 100 µA total, which means that the individual component specification—say the filter—is limited to 50 µA. If the filter customer has had its product tested for out-of-limit areas ...
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