Capacitance Thickness Gauge / Displacement Gauge Frequently Asked Questions

Linearity indicates the maximum range of measurement error in relation to the true value of distance.

In the case of displacement measurement, linearity specifications determine accuracy. For example, when using the VE-1520 sensor, the full scale (F.S.) is 1500 μm, resulting in an accuracy of ±2.25 μm.

In the case of thickness measurement, the distance is measured by two sensors, and the thickness is calculated through computation, so the maximum error specification is twice that of the linearity specification. However, in typical thickness measurements, the reference thickness is calibrated using a master piece. When the distance change is small, the variation in error is also small, so performing master piece calibration can help reduce measurement errors. By preparing master pieces for each type of inspection work and minimizing the thickness difference between the master piece and the inspection work, as well as controlling the changes in work position during measurement, it is possible to keep the error below the specification.