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IMPROVED LOW FREQUENCY ACCELEROMETER CALIBRATION

This paper will discuss a newly developed implementation of low frequency accelerometer calibrations. The goal is an improved low frequency accelerometer calibration system capable of performing quality measurements with low uncertainties while maintaining good throughput and the simplicity of traditional back-to-back calibration techniques. By using an optical encoder as the measurement reference instead of a traditional reference accelerometer, limitations due to shaker stroke length are nearly eliminated, with the practical limitation for a quality calibration measurement at ultra low frequency being the resolution of the sensor under test itself.