Krohn Hite Dual Channel Butterworth Bessel Programmable Filter 3988

The Krohn-Hite Model 3988 Butterworth/Bessel dual channel
filter is one of a family of filters carefully designed with the user in
mind, providing ease of operation, reliability and price
competitiveness.
The 3988 provides a tunable frequency range from 0.03Hz to
1MHz in the low-pass mode and 0.03Hz to 300kHz in the
high-pass mode. Both modes are extended down to 0.003Hz with
the 002 option. The frequency response characteristic is either
maximally flat (Butterworth) for clean filtering in the frequency
domain, or linear phase (Bessel) to provide superior pulse
filtering.
Each channel of the 3988 is an 8-pole, wide range,
low-pass/high-pass filter or an amplifier providing gains to 70dB
in 0.1dB steps. The 3988 will accept input signals of æ10V peak at
0dB gain and has selectable ac or dc coupling. Overload detectors
are standard and assist the user in detecting input signals or
incorrect gain settings. Ninety-nine groups of non-volatile
memory for storage of front panel set-ups are stored in
battery-backed CMOS which can be recalled with a simple
command.

• Two Channel
• Cutoff Frequency Range: 0.03Hz to 1MHz
• Attenuation Slope: 48dB/Octave
• Filter Modes: Low-Pass and High-Pass
• Responses: Butterworth and Bessel
• Pre-Filter and Post-Filter Gains
• Input Type: Differential and Single-Ended
• Amplifier (Filter By-Pass) Mode
• GPIB Programmable

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