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8-Pole analog low pass butterworth filter daughterboard, ideal for anti-aliasing. For a summary of aliasing and why you might need an AFS filter, click here.
End user installs between 1 and 6 filter daughterboards onto each i423 card, one daughterboard per channel, and installs between 1 and 14 cards into each i4xx card cage.
Filters can be used to digitize waveforms into Windows Computer, or can be used independently due to both filter output pin at Hd44 connector.
i500 analog filter provides extremely low ±0.01dB maximum passband ripple for Fin/Fc ≤ 0.5. If one uses further oversampling, digital filtering and desampling; then passband ripple is ±0.002dB for Fin/Fc ≤ 0.8 due to the accuracy of a 30-pole digital filter.
i500 analog filter provides stopband attenuation of ≥ 76dB for Fin/Fc ≥ 3
Includes Free instruNet World strip chart recorder software; or purchase powerful PLUS version.

4 different filter products, each with different cut off frequencies: 380Hz, 1KHz, 3.3KHz, 10KHz. However, further digital processing provides other cutoff frequencies lower than these. For example, with an i500 Fc=1KHz analog filter one can digitize at ANY sample rate less than 2Ks/sec/channel and have a DIGITAL low pass filter provide anti-aliasing.
Signal first passes through i423 signal conditioning amplifier before reaching i500 analog filter; therefore, one can attach directly to the following sensors: .
Digitize any combination of channels at 166,000 samples-per-second aggregate
USB 2.0 high speed data acquisition hardware for 32bit or 64bit Windows ≥ Xp Sp3, Vista, 7, 8 or 10