Accuracy and Precision of Microtrac Particle Size Analyzers Microtrac 粒度分析仪的准确度和精密度

Accuracy and precision have distinct meanings. Generally, accuracy refers to the ability of an analytical device to provide a measurement that is within a defined error from an established, true, and verifiable value. Precision is a measure of the recurrence of a value whether it is accurate or not. Two types of precision can be described: repeatability and reproducibility. In terms of particle size measurement, repeatability refers to the ability of an instrument to repeat its own measurement while the same sample resides in the circulating system. Reproducibility, on the other hand, is related to the comparison of two or more instruments in which representative samples are introduced to each of the instruments. Repeatability is statistically more variation-free than reproducibility because a single instrument measures the same recirculating sample when fluid suspended particles are measured. 准确度和精密度是两种不同的概念。通常地，准确度是指分析仪器提供在一定误差测量范围内的准确性，而精密度是对数值的准确性的重复测量。精密度的两种类型可描述为：重复性和重现性。 对于粒度测量，重复性是指在分析仪器的循环系统内的样品不断地重复同一种测量方法，另一方面，重现性是指两种或多种分析方法对样品的测量结果的比较。从统计学来说，对于一种分析方法测量悬浮液颗粒样品时，重复性比重现性更可变。