Abstract: This paper presents an automatic measurement system for positioning measurements. The system is based on an LVDT transducer and a LabVIEW program was developed for synchronous detection of the LVDT output signal. A complete characterization of the measurement system using a linear actuator was performed in order to obtain accurate metrological values of linearity and hysteresis. The paper will also include data reduction and statistical processing of measurement data to validate the measurement system performance and conformity. An approach for real-time statistical process control of linearity it is presented for measurement system reliability monitoring overtime and, simultaneously, to implement a real-time fault detection and conditioned-based maintenance 1. It is also important to underline that a preliminary version of the system presented in this paper has been successfully used in electronics automotive manufacturing plants to control the positioning of pointers base on the instrument panel that is a critical operation in cockpits assembly.

Keywords: LVDT, Linearity, Sensitivity, Hysteresis, Synchronous detection, Statistical analysis, Statistical process control, Automotive industrial application.
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