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Machine Design

Filter for Data Collection

The AAF-2Fe, an antialiasing low-pass filter module, has two channels for noise reduction that preserve signal integrity of analog measurements for process control,


sound and vibration testing, ultrasonics, acoustics, structural analysis, and laboratory data-collection applications. The module works with all 8, 12, and 16-bit A/D modules and boards, and has factory-set differential instrumentation gains ranging from 1 3 to 10,000 3 . It also has a true (not software compensated) minimal offset of 1.5 Vm or better and has accurate unity gain and a ±10-V input and output range. Filter characteristics (Butterworth, Bessel, Cauer, or Linear Phase) are selectable to any corner frequency within the maximum filter bandwidth. Filters can be tuned to a variety of bandwidths from 0 to 200 kHz, and output impedance is <0.001 ohms. Common mode rejection is 90 to 110 dB. Input and output range is up to 10 V while gain accuracy is 0.001 dB at 1 skHz.

Alligator Technologies,
2183 Fairview Ave., Suite 220, Costa Mesa, CA 92627,
(949) 515-1400,

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