Primary sinusoidal calibration of accelerometers.

Accurate vibration measurements require suitably calibrated transducers. A new system for primary sinusoidal calibration of the voltage sensitivity of accelerometers according to Method 1 (fringe‐counting) of ISO 16063‐11 has been implemented at the NRC Institute for National Measurement Standards. The system includes a new shaker that is capable of generating sufficient acceleration for calibration of accelerometers at frequencies as low as 2 Hz. The design, construction, and testing of the system will be described. Factors that influence the measurement uncertainty of the calibrations such as transverse motion, rocking motion, acceleration stability, distortion, and repeatability have been evaluated and will be discussed.