电阻器和电容器优先数系

[中文适用范围]： 本国际标准提供了一系列电阻器的电阻值和电容器的电容值的优先数值。此类具有定义数值分辨率的系列的定义，是对具有各自电容值或电阻值的电容器和电阻器进行标记和编码的基本前提，正如IEC 60062所描述。注：本标准定义的数值系列基于10^(1/r)的渐进比率，其中r = 3 · 2^i，i为0至6范围内的整数，例如12^(1/10)。这种渐进比率系统是在1952年首次发布本标准之前建立的，这是±5%、±10%和±20%公差标准化及相关商业实践的结果。从未认为采纳基于10^(1/10)系统的ISO实践是可实现的。 [外文原描述]： IEC 60063:2015 provides series of preferred values for the resistance of resistors and for the capacitance of capacitors. The definition of such series with a defined numeric resolution is a basic prerequisite for the marking and coding of capacitors and resistors with their respective capacitance or resistance values as described in IEC 60062. This edition includes the following significant technical changes with respect to the previous edition: - revision of the information on a relationship between an E Series and the tolerance of a resistance or capacitance value of a respective component; - introduction of advice on a possible deduction from the marking of a component to an associated E Series and also to an associated tolerance; - complete editorial revision.