Abstract
Measuring amplifiers are used for transducer output signal conditioning in many dynamic measurement applications. For a traceable measurement, a calibration of all components of the measuring chain—and therefore of the conditioning amplifiers, too—is mandatory. In this paper methods for a dynamic calibration of different types of conditioning amplifiers are presented. Measurement uncertainties and calibration results for typical amplifiers are discussed.
Highlights
For the dynamic measurement of mechanical quantities, the European research project Traceable Dynamic Measurement of Mechanical Quantities within the framework of the European Metrology Research Programme (EMRP) focused on the development of procedures for traceable measurements of the quantities force, pressure and torque [1,2,3]
To show the importance of a suitable calibration for amplifiers used for dynamic measurements, different calibration results for bridge, charge, voltage- and IEPE conditioning amplifiers are presented
The excitation level was 2 mV/V; all filters were switched off or set to their highest value available. It becomes obvious from the calibration results that bridge amplifiers can have a significant varying magnitude response even in low frequency regions, which shows the importance of dynamic calibrations
Summary
For the dynamic measurement of mechanical quantities, the European research project Traceable Dynamic Measurement of Mechanical Quantities within the framework of the European Metrology Research Programme (EMRP) focused on the development of procedures for traceable measurements of the quantities force, pressure and torque [1,2,3]. Standards describing the procedures of a dynamic calibration of conditioning amplifiers are under development in national and international standardization working groups, namely the German DKD Fachausschuss “Kraft und Beschleunigung” (technical committee on “Force and Acceleration”) and the Working Group 6 of ISO TC 108/SC 3 “Use and calibration of vibration and shock measuring instruments”. This will remedy the current lack of validated procedures within the foreseeable future. The subsequent section will provide an overview of the current state of knowledge and will further give an outline of what is to be expected from the future documentary standards
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