内容简介：Most industrial measurement system can be divided two categories, one is variable measurement system, another is attribute measurement system. An attribute gage cannot indicate how good or how bad a part is , but only indicates that the part is accepted or rejected. The most common of these is a Go/No-go gage The Five Characterizations of Measurement System: 1. Location Variation: Bias; Stability; Linearity Bias is the difference between the observed average of measurements and a reference value. Bias is often referred to as accuracy. It is a systematic error component of the measurement system The Five Characterizations of Measurement System: 1. Location Variation: Bias; Stability; Linearity Stability(Alias: Drift): Stability is the total variation in the measurements obtained with a measurement system on the same master or parts when measuring a single characteristic over an extended time period. A stable measurement process is in statistical control with respect to location. The Five Characterizations of Measurement System: 1. Location Variation: Bias; Stability; Linearity Linearity is the difference in the bias values through the expected operating range of the measurement instrument. It is a systematic error component of the measurement system. The Five Characterizations of Measurement System: 2. Width Variation: Repeatability; Reproducibility; Gage R&R Repeatability is the variation in measurements obtained with one measurement instrument when used several times while measuring the identical characteristic on the same part by an appraiser. It is a Within-system variation, commonly referred to as E.V.---Equipment Variation.
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