Calibration of the Piezo-electric Element in Measuring of Force

In measuring the force by the piezo-electric element, one of the important problems seems to be a calibration of the piezo-electricity or the sensitivity of the measuring apparatus. This paper deals with the results of calibrations performed by means of the static load and an electrometer tube circuit, and by means of the inertia force due to vibrated weight on the piezo-electric element. According to above calibration, if the value of the time constant of static calibration circuit is large enough (the anthors' case : 2552 sec), the static calibrated value seems to be rather free from serious mistakes compared with the dynamic calibrated value.