In this simulator, you will explore the principles of vibration sensor calibration using the comparative method, based on the ISO 16063-21 standard. Adjust the vibration frequency or amplitude to observe its effect on the waveforms and the sensor outputs. By manually altering the sensor’s deviation and clicking the “Measure” button, you will learn how the sensitivity of the sensor under test is calculated with the aid of a reference sensor.
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The ISO 16063-21 standard describes a method for calibrating vibration sensors by comparing them against a reference sensor. A reference sensor is one whose sensitivity has been previously established through a valid calibration process, serving as the basis for comparison. In this simulation setup, both the reference sensor and the sensor under test are mounted on a shaker, ensuring they are subjected to identical vibration along the measurement axis. Sensitivity indicates the voltage generated by a sensor per unit of acceleration; in this software, it is expressed in units of mV/g. Assuming equal gain for both channels, the sensitivity of the sensor under test is calculated by multiplying the reference sensitivity by the ratio of the output voltages of the two sensors. In a frequency test, the vibration acceleration remains constant while the frequency is varied to examine the sensor’s response across different frequencies. In an amplitude test, the frequency remains constant while the acceleration is varied to assess the linearity of the sensor’s output relative to the vibration intensity. In the software’s ideal model, the nominal sensitivity is 100 mV/g; a default manual deviation of -3% adjusts this to 97 mV/g—note that these specific values are not mandated by the standard. A separate deviation plot, using its own vertical scale, provides a clearer view of minor differences between the sensors’ outputs; however, this deviation alone does not determine whether a sensor passes or fails. This tool is intended for educational purposes; in an actual calibration, factors such as proper sensor mounting, equipment condition, the validity of the reference, and measurement uncertainty must also be evaluated in accordance with the standard.
