A procedure for dynamic force calibration using sinusoidal excitations of force transducers is described. The method is based on a sinusoidal excitation of force transducers equipped with an additional top mass excited with an electrodynamic shaker system. The acting dynamic force can in this way be determined according to Newton's law as mass times acceleration, whereby the acceleration is measured on the surface of the top mass with the aid of laser interferometers. The dynamic sensitivity, which is the ratio of the electrical output signal of the force transducer and the acting dynamic force, is the main point of interest of such a dynamic calibration. In addition to the sensitivity, the parameter stiffness and damping of the transducer can also be determined. The first part of the paper outlines a mathematical model to describe the dynamic behaviour of a transducer. This is followed by a presentation of the traceability of the measured quantities involved and their uncertainties. The paper finishes with an example calibration of a 25 kN strain gauge force transducer.

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.