Interface module captures acceleration, vibration data
By Warren Webb, Technical Editor -- EDN, June 19, 2008
The latest analog-input board from United Electronic Industries features four isolated accelerometer/vibration-sensor channels with sample rates to 125k samples/sec per channel, 24-bit resolution, and 109-dB SNR (signal-to-noise ratio). The DNA-AI-211 allows direct connection to industry-standard, IEP (integral-electronics-piezoelectric), two-wire vibration sensors and provides both software and LED annunciation of open or shorted sensors. A combination of analog and digital FIR (finite-impulse-response) filters provides the board’s 100-dB digital antialiasing filtering. The digital filter allows a combination of a passband ripple of ±0.005 dB, steep falloff, and a stopband floor of −100 dB, which are unattainable figures with simple analog filtering. The digital nature of the filter also ensures that each filter induces an identical phase shift, so no filter-induced interchannel phase jitter will impact or corrupt subsequent analysis. The factory provides support for Windows, Linux, and VxWorks operating systems; several programming languages; and application packages, such as LabView, Matlab, and DasyLab. Prices for the DNA-AI-211 start at $2000, and it is available from stock.
