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Description of BS EN 60063:2015 2015This International Standard 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 . NOTE The number series defined in this standard are based on progressive ratios of [Formula removed.], with r = 3 · 2 i , and i being a whole number in the range of 0 to 6, hence e.g. of [Formula removed.] . This system of progressive ratios had been established prior to the 1952 release of the first edition of this standard 1 as a consequence of the standardisation of tolerances at ±5 %, ±10 % and ±20 % and the related commercial practice. An adoption of the ISO practice, based on a [Formula removed.] system, was never considered achievable.
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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