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.

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     General Purpose Tunable Filters  |  Signal Conditioning Systems  |  Fixed Frequency Filter Modules  |  Fixed Frequency Filter Systems
SELECTION GUIDE
Model Model 3940
Butterworth/Bessel
Filter
Model 3944
Butterworth/Bessel
Filter
Model 3945
Butterworth/Bessel
Filter
Model 3955
Butterworth
Filter
Model 3988
Butterworth/Bessel
Filter
Remote Controlled 2 Channel Filter Model 3940 Remote Controlled 4 Channel Filter Model 3944 Remote Controlled 3 Channel Filter Model 3945 Remote Controlled Dual Low-Pass Filter Model 3955 Remote Controlled 2 Channel Filter Model 3988
Front View
Rear View
Front View Front View
Rear View
Front View
Rear View
Front View
Rear View
Attenuation Rate 24dB/Octave 24dB/Octave 24dB/Octave 24dB/Octave 48dB/Octave
Independent Channels 2 4 3 2 2
Cutoff Frequency 3Hz to 2MHz 3Hz to 2MHz 3Hz to 25.6MHz 170Hz to 25.6MHz 0.03Hz to 1MHz, LP
0.03Hz to 300kHz, HP
Responses Butterworth, Bessel Butterworth, Bessel Butterworth, Bessel Butterworth Butterworth
Functions LP, HP, BP, BR * LP, HP, BP, BR * LP, HP, BP, BR * LP * LP, HP, BP, BR
BP, BR Channels 1 2 1 None 2
Input Type SE ** SE ** SE ** SE ** SE **, Differential
Input Volts 4.5V peak 4.5V peak 4.5V peak 1.5V peak 10V peak
Output Volts 6.5V peak 6.5V peak 6.5V peak 3V peak 10V peak
Pre-Filter Gain 20dB 20dB 20dB 20dB 50dB in 10dB steps
Post-Filter Gain 20dB 20dB 26dB 26dB 20dB in 0.1dB steps
Data Sheet Data Sheet Data Sheet Data Sheet Data Sheet Data Sheet
Manual Operating Operating Operating Operating Operating
 *  LP = low-pass, HP = high-pass, BP = band-pass, BR = band-reject; Band-pass and band-reject require 2 channels.  ** SE = Single-Ended

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