NEW 4-, 6- & 8-Pole 5BAF Filter Modules Available Click Here for more information on this product The 5BAF Series of fixed frequency differential-input filters have been expanded to include 4-, 6- and 8-pole Butterworth and Bessel low-pass and Butterworth high-pass filters with corner frequencies (fc) from 1.00 Hz to 100 kHz. These filters are pin-out and package compatible with industry-standard 5B Series signal conditioning modules and operate from a non-critical +5, +/- 10% volt power source for applications utilizing a +5V logic source.