Application of the Taguchi Method to Dew-point Meter Calibration

Abstract

According to different calibration systems and characteristic of calibrated items, there are different factors influence measurement results. This paper discusses the factors that influence measurement results in dew-point meter calibration with two-pressure humidity generator measurement system at National Measurement Laboratory (NML). In this analysis, four control factors have been chosen, including the relative humidity, the flow rate of standard gas source input, the flow rate through the dew-point meter, and the waiting time before reading data from the dew-point meter. Taguchi method is used to find out the best combination of the factors and their levels. A suitable orthogonal array was selected and experiments were conducted under the different temperature. By calculating the mean square deviation (MSD) and the signal-to-noise (S/N) ratio, the best combination can be found. After the experiments, the lab staff can easily find out the best combination without experimenting full factorial design, and improve the reliability of measurement effectively.