Our remote controlled Tunable Active Filters are analog, GPIB, signal conditioning filters that are digitally controlled via the front panel or over the GPIB interface bus. They are frequency discriminating instruments whose signal transmission characteristics are functions of frequency. Their basic function is to pass wanted signals and suppress unwanted signals, according to frequency. All Krohn-Hite filters provide a combination of reliability, performance and economy.
Model 3940 - 2 Channels
•  2 Independent Filter Channels
•  3Hz to 2MHz
•  1 Band-Pass/Band-Reject Channel
•  Attenuation: 24dB/Octave (4-Pole)
•  Filter Modes: Low-Pass and High-Pass
•  Response: Butterworth and Bessel
•  Pre-Filter (Input) Gain: 0dB and 20dB
•  Post-Filter (Output) Gain: 0dB and 20dB
•  Remote Control: IEEE-488
Model 3944 - 4 Channels
•  4 Independent Filter Channels
•  3Hz to 2MHz
•  2 Band-Pass/Band-Reject Channels
•  Attenuation: 24dB/Octave (4-Pole)
•  Filter Modes: Low-Pass and High-Pass
•  Response: Butterworth and Bessel
•  Pre-Filter (Input) Gain: 0dB and 20dB
•  Post-Filter (Output) Gain: 0dB and 20dB
•  Remote Control: IEEE-488
Model 3945 - 3 Channels
•  2 Independent Channels 3Hz to 2MHz
   Low-Pass, High-Pass, Band-Pass, Band-Reject
•  1 Independent Channel 170Hz to 25.6MHz
    Low-Pass Butterworth Only
•  2 Band-Pass/Band-Reject Channels Using
   any 2 Channels in Series  3Hz to 7MHz Max
•  Attenuation: 24dB/Octave (4-Pole)
•  Response: Butterworth and Bessel
•  Pre-Filter (Input) Gain
•  Post-Filter (Output) Gain
•  Remote Control: IEEE-488
Model 3955 - 2 Channels
•  2 Independent Channels
•  170Hz to 25.6MHz
•  Low-Pass
•  Attenuation: 24dB/Octave (4-Pole)
•  Response: Butterworth
•  Pre-Filter (Input) Gain
•  Post-Filter (Output) Gain
•  Remote Control: IEEE-488
Model 3988 - 2 Channels
•  2 Independent Filter Channels
•  0.03Hz to 1MHz Low-Pass
•  0.03Hz to 300kHz High-Pass
•  1 Band-Pass/Band-Reject Channel
•  Attenuation: 48dB/Octave (8-Pole)
•  Response: Butterworth and Bessel
•  Pre-Filter (Input) Gain: 0dB to 40dB in 10dB Steps
•  Post-Filter (Output) Gain: 0dB to 20dB in 0.1dB Steps
•  Remote Control: IEEE-488


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GPIB Programmable Analog Filters

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