Krohn Hite Bessel Programmable Filter 3940

The Krohn-Hite Model 3940 programmable, dual channel,
Butterworth/Bessel filter offers a programmable or benchtop filter
covering a cutoff frequency range from 3Hz to 2MHz. It has a
frequency response characteristic of maximally flat (Butterworth)
for clean filtering in the frequency domain, or linear phase
(Bessel) to provide pulse signal filtering. The passband gain is
unity, and the attenuation slope is 24dB/octave per channel. The
3940 will accept input signals of ±4.5V peak and provides input
and output gains of 0dB or 20dB which can be selected via the
front panel keyboard or over the GPIB bus.

• Frequency Range: 3Hz to 2MHz
• Filter Types: Butterworth or Bessel
• Attenuation Slope: 24dB/Octave/Channel
• Input Gain: 0dB or 20dB
• Output Gain: 0dB or 20dB
• Stopband Attenuation: >95dB
• By-Pass Mode

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