Krohn Hite Dual Low-Pass Butterworth Bessel Programmable Filter 3955

The Krohn-Hite Model 3955 programmable, dual channel,
low-pass filter is the first dual low-pass programmable filter of its
kind, covering the wide cutoff frequency range from 170Hz to
25.6MHz with 2 digits of resolution. The 3955 is a 4-pole,
maximally flat (Butterworth) filter, with an attenuation slope of
24dB/octave and a stopband attenuation of >100dB referred to
1Vrms input. The filter has selectable ac or dc coupling and
selectable 1M or 50 ohm input impedance. Programmable input
gains to 20dB and output gains to 26dB are standard.

• 2 Independent Channels
• Frequency Range: 170Hz to 25.6MHz
• Response: Butterworth or Bessel (optiona
• Attenuation Slope: 24dB/Octave
• Input Gain: Selectable up to 20dB
• Output Gain: Selectable up to 26dB
• Noise: Typically <250µV referred to input
• Stopband Attenuation: >100dB
• Remote Control: GPIB

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