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任何部件都不可能达到完全的精准,它有一个允许变动的范围,这个范围就叫容差。例如某电网的输出电压为220±5V,那么,该输出电压的规格范围就是215V-225V,其中220V代表电压的目标值(Target),而5V就代表了电压的容差(Tolerance)。系统也有它的目标值和容差,这两者的实现程度体现了产品质量的优劣差异。因为一个系统是由若干个部
No part of any precision can be achieved, it has a range of allowable changes, this range is called tolerance. For example, a grid output voltage of 220 ± 5V, then the output voltage range is 215V-225V, of which 220V represents the target voltage (Target), and 5V represents the voltage Tolerance (Tolerance). The system also has its target values and tolerances, both of which represent the strengths and weaknesses of product quality. Because a system is composed of several ministries