Method for calibrating appliances for the measurement of force o

Details Method for calibrating appliances for the measurement of force o Method for calibrating appliances for the measurement of force o

1988-11-10

1989-09-26

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to force

73 1B, 177211, G01L 122, G01L 126

Patent

active

048691135

ABSTRACT:
In order to calibrate an appliance for measuring force or moment, the measuring element (l) carries a strain gage bridge (R.sub.1, R.sub.2, R.sub.3, R.sub.4) for delivering a signal which is mainly sensitive to the force or to the moment to be measured and is provided at the time of manufacture with two other strain-gage bridges (R.sub.5, R.sub.6, R.sub.7, R.sub.8); (R.sub.9, R.sub.10, R.sub.11, R.sub.12) for delivering signals which are mainly sensitive to two parasitic stresses other than the force or the moment to be measured. In a first stage, the method consists in measuring the signals delivered by the three strain-gage bridges in the absence of any load applied on the measuring element, then under a number of known reference loads chosen from among those to which each strain-gage bridge is the most sensitive. In a second stage, the reference measurements are used as a basis for calculating the parameters of sensitivity according to which each of the signals delivered by the measuring bridges is a function of the applied loads. In a third stage, these parameters of sensitivity are used as a basis for calculating the correction to be made in the force or the moment measured by the first strain-gage bridge (R.sub.1, R.sub.2, R.sub.3, R.sub.4).

REFERENCES:
patent: 4565255 (1986-01-01), Sarrazin
patent: 4637263 (1987-01-01), Fritz et al.
patent: 4640139 (1987-02-01), Fritz
patent: 4657097 (1987-04-01), Griffen
patent: 4726436 (1988-02-01), Fukuyama et al.

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