| Krohn-Hite 3940 Tunable Active Filter
The Krohn-Hite 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.
The filter can be
programmed to operate in low-pass, high-pass, band-pass or
band-reject modes, or the two channels can be interconnected to achieve
48dB/octave high-pass or low-pass slopes.
The Krohn-Hite
3940 offers to the user 99 groups of non-volatile memory for storage of
front panel set-ups, which are stored in battery-backed CMOS. Set-ups can
then be recalled with a simple command.
The Krohn-Hite 3940
also provides a self-test diagnostics upon power-up of its internal
memory to insure the unit is operating properly. If a failure occurs, the
display will indicate which ROM or RAM has failed.
Applications for
the Krohn-Hite 3940 are anti-aliasing, random noise testing, sound
measurements, sound recording, suppressing interference in audio
communications circuits and many more.
Features:
- Frequency Range: 3Hz to 2MHz
- Filter Types: Butterworth or
Bessel
- Attenuation Slope:
24dB/Octave/Channel
- Input Gain: 0dB or 20dB
- Output Gain: 0dB or 20dB
- Stopband Attenuation: >95dB
- By-Pass Mode
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