Dispersion analysis of accelerometer shock calibrations by comparison using a new exciter developed at Inmetro

Abstract

The applicability of a new mechanical shock exciter developed at the Vibration Laboratory of Inmetro for primary calibrations was analysed for calibrations of accelerometers by the comparison method. Using two back-to-back reference transducers and a single-ended general purpose accelerometer as device under test (DUT), calibrations were performed using the exciter developed at Inmetro, and the results were compared with those obtained with a commercial shock exciter. Two shock amplitudes and two pulse durations were applied to evaluate the dispersion of the DUT shock sensitivity. This analysis shows that the new exciter provides appropriate repeatability for shock sensitivity measurements, indicating a powerful system for generation of shock pulses.