Influence of acceleration harmonic distortion on shake table calibration for velocity seismometer

Acceleration and velocity harmonic distortion are theoretically analyzed, and then based on laboratory virtual instrument engineering workbench (Labview for short) digital measuring system is designed for the low-frequency vibration signals. Deviation between testing data from this system and the reference value provided by National Institute of Metrology is minor. Seismometer calibration results indicate that acceleration waveform and its distortion reflect the actual condition of the shake table in a much harsher way, providing more precise information for the seismometer test on the shake table.