Krohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIB
Krohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIBKrohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIBKrohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIBKrohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIBKrohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIBKrohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIBKrohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIBKrohn-Hite 3940 3Hz-2MHz, 0-20 dB Gain Dual Channel Programmable Filter w/ GPIB
$800.00
KH Model 3940 3Hz to 2MHz, High-Pass/Low-Pass Butterworth/Bessel Dual-Channel Programmable Filter

Clean and in excellent condition. Powered and responded to input as designed. Due to limited experience with this system, we stuck to testing for pass-thru signal adjustments as shown. The system responded to frequency cutoff and gain changes appropriately.

This is a current model with access to resources and manuals. It came from a clean rack mounted system and is guaranteed fully functional. Hassle-Free warranty.


**Oscilloscope and Signal Generator in photos were for testing purposes only and are not included in sale.**



Manufacturer Description:

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.

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.

  • Attenuation Rate:  24dB/Octave
  • Independent Channels:  2
  • Cutoff Frequency:  3Hz to 2MHz
  • Responses:  Butterworth, Bessel
  • Functions:  LP, HP, BP, BR *
  • BP, BR Channels:  1
  • Input Type:  SE **
  • Input Volts:  ±4.5V peak
  • Output Volts:  ±6.5V peak
  • Pre-Filter Gain:  20dB
  • Post-Filter Gain:  20dB
  • Stopband Attenuation: >95dB