This International Standard establishes a series of preferred values for the resistance of resistors and the capacitance of capacitors. Defining these series with a specific numeric resolution is essential for the proper marking and coding of capacitors and resistors, as outlined in IEC 60062.
NOTE: The number series defined in this standard are derived from progressive ratios of �=10, where �=3⋅2� and � is a whole number ranging from 0 to 6, resulting in values such as 12⋅10. This system of progressive ratios was established before the first edition of this standard was released in 1952, as a result of standardizing tolerances at ±5%, ±10%, and ±20%, reflecting prevailing commercial practices. The adoption of an ISO practice based on a 10⋅10 system was never deemed feasible.
