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The Models 3905C and 3916C are Programmable Multi-channel Filter Systems which can be configured with many types of filter cards; Elliptical filters for anti-aliasing, Butterworth filters for clean filtering in the frequency domain, and Bessel filters which provide superior or pulse or complex signal filtering. Filter cards that provide selectable frequency cutoffs as low as 0.01Hz and as high as 25.6MHz with roll-off rates of 24dB to 115dB/octave make each System unique to any application. The System concept was designed with the user in mind, providing ease of operation, flexibility and performance.