The Krohn-Hite 3550 Variable Filter is a multifunction filter that offers band-pass, band-reject, low-pass or high-pass operation in a single piece of equipment. The mode of operation can be selected by a front panel switch. The cutoff frequency is continuously adjustable from 2Hz to 200kHz.
Butterworth or Low Q response characteristics
Calibration accuracy: ±5%
Insertion loss: 0 dB
Attenuation slope: 24 dB per octave
Maximum attenuation: 60 dB
Hum and noise: 200 µV
Bandwidth: 2Hz to 3MHz