The 3955 is a Filter from Krohn Hite. Electronic filters perform a variety of signal-processing functions with the purpose of removing a signal’s unwanted frequency components, enhance desired ones, or both. There are many types of electronic test equipment filters, including those that are passive, active, analog, digital, low pass, high pass, linear, and nonlinear. Linear filters are the most commonly used for most electronic equipment applications.
- Frequency Range: 170 Hz to 25.6 MHz
- 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
The Krohn-Hite 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 170 Hz to 25.6 MHz with 2 digits of resolution. The Krohn-Hite 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.