Krohn Hite Programmable Butterworth/Bessel Filter

Krohn-Hite 3940/3944 programmable dual channel (3940) and four channel (3945) Butterwoth/Bessel filters offers a programmable or bench top filter covering a cut-off 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. Applications of the Krohn-Hite 3940/3944 are anti-aliasing, random noise testing, sound measurements, sound recording, suppressing interference in audio communications and many more.