Dynamic calibration of bridge amplifiers used for periodical force measurement

This contribution describes how bridge amplifiers used in dynamic force measurement can be dynamically calibrated. A special analogue device, called “bridge standard”, can be used to simulate a bridge detuning in the mV range as, like it occurs in strain gauge force transducers [1]. The frequency response of the amplifier has to be corrected for the sensitivity of the force transducer. The principle of the bridge standard as well as measurements of different amplifiers will be presented. In addition, the influence of the amplifier frequency response of the parameter identification of the force transducer will be discussed.