3800 - Krohn-Hite Tunable Filters

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Technical Specifications

High end frequency limit


Operation Modes

Extra Specifications
Narrow-band tracking filter

Product Description

The 3800 is a very narrow-band tracking filter with the unique ability to track without a reference signal. 

  • 1 Hz to 100 kHz frequency range
  • Selectable bandwidths from 0.001 Hz to 1 kHz
  • Locks on and tracks an input signal buried 10 dB below the noise level
  • Slope attenuation of 12 db per octave of bandwidth
  • Four pole Butterworth or RC filter response
  • Automatic gain control over a dynamic range of 70 dB 
  • Q factor as high as 100,000,000
  • Internal oscillator may be tuned separately or synched to center frequency