The Krohn-Hite 3103R Variable Bandpass Filter operates in the frequency range of 10Hz to 3MHz. The frequency characteristic of this filter very closely approximates a fourth-order Butterworth with maximal flatness for cleanest filtering in the frequency domain.
Calibration accuracy ±10%
Pass-band gain is unity (0 dB)
Attenuation rate of 24 dB per octave
Maximum attenuation 80dB with an amplitude of 3 V rms and output hum and noise is less than 150 µV
Insertion loss: 0 dB ±0.5 dB