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Bi-modal dynamic filtering
Filtering operates in 2 modes:1. For noise and small surges (hundreds of volts) the filter requirementis for higher frequencies.2. For serious surges (thousands of volts) much greater filtering is addedas a second mode of operation. The filter performance adjusts dynamically to the power line voltage variations, so performance is not compromised whenthe powerline voltage changes due to use of generators or with brown-outconditions.  This is especially important for the military which operateall over the world with many voltage conditions