TRACEABILITY AND UNCERTAINTY OF LOW-FREQUENCY VIBRATION MEASUREMENTS

摘要

Measurements of vibration in the range 20 Hz to 50 mHz are of interest to consultants, manufacturers and researchers in such fields as ground vibration, impact testing of safety equipment and human exposure to vibration. However, if the vibration transducers and the voltmeters or recorders used with them have not been specifically calibrated in this range the reading error cannot be corrected. In some cases measurements may not be legally acceptable. This paper briefly discusses low frequency measurement errors and uncertainties and the chain of traceability through calibrations performed at the National Measurement Laboratory.