Low voltage/high frequency noise is caused by everyday events such as turning on machinery, motors, or equipment. Although noise is less dramatic than high voltage transients, the long term effects of these frequent disturbances can be as damaging. Filtering systems such as SolaHD Active Tracking Filters provide clean AC power by eliminating lower voltage noise. (read more)

The Krohn-Hite 3360 Series provides a tunable frequency range from 0.1Hz to 200kHz, and with the 002 option, the range is extended to 0.005Hz. Each channel of the 3360 Series is a selectable low-pass or high-pass, 4-pole filter providing an input gain to 50dB, and an output gain to 20dB selectable in 0.1dB steps. Standard response types are Butterworth and Bessel. (read more)

The Krohn-Hite Model 3945 programmable filter provides one Butterworth channel of low-pass, tunable over the range from 170Hz to 25.6MHz; and two independent Butterworth or Bessel channels of low-pass, high-pass or bypass, one channel of band-pass or band-reject, tunable over the range from 3Hz to 2MHz. (read more)

The KH Model 3380 Filter Series are one, two or four channel filters providing ease of operation and the reliability Krohn-Hite has been known for since 1949; along with a price that will fit any budget. (read more)

The Krohn-Hite Model 3944 is a 4-channel, Butterworth/Bessel filter providing GPIB/benchtop filtering covering a cutoff frequency range from 3Hz to 2MHz. Passband gain is unity, and the attenuation slope is 24dB/octave per channel. The 3944 will accept input signals of ±4.5V peak providing input and output gains of 0dB or 20dB selectable via the front panel keyboard or the GPIB bus. (read more)

The Krohn-Hite Model 3940 programmable, dual channel, Butterworth/Bessel filter is a GPIB/benchtop filter covering a cutoff frequency range from 3Hz to 2MHz. Attenuation slope is 24dB/octave per channel. The 3940 will accept input levels of ±4.5V peak. Pre and post-filter gains of 0dB or 20dB is also provided. All functions are front panel or GPIB bus controlled. (read more)

The Krohn-Hite Model 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 low end frequency cutoff is 0.003Hz with the 002 option. 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. (read more)

The Krohn-Hite Model 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 170Hz to 25.6MHz with 2 digits of resolution. The 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. (read more)

The KH 3A, 3B, 3C and 3D Series of continuous-time fixed-frequency precision active filter modules from Krohn-Hite provide filtering in a 1 to 16-pole compact package, with the choice of cutoff frequencies selectable within the frequency range from 1Hz to 2MHz low-pass and 1Hz to 600kHz high-pass. (read more)

Liebert Interceptor ATF Series active tracking filter offers the highest level of facility-wide surge protection with the lowest UL 1449 clamping ratings available. (read more)