The Krohn-Hite 3321 Variable Filter is a solid state, variable electronic Filter that is digitally tuned over the range from 0.01Hz to 99.9kHz. Its single channel can be operated in either the High-Pass or Low-Pass mode. It has an attenuation slope of 24 dB per octave. The frequency response characteristic of the unit is a fourth-order Butterworth with maximum flatness for cleanest filtering in the frequency domain. For pulse or transient signal filtering, a front panel switch is provided to change the frequency response to RC optimum for transient-free filtering.
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