BS EN 60063:2015
Preferred number series for resistors and capacitors
| Standard number: | BS EN 60063:2015 |
| Pages: | 16 |
| Released: | 2015-06-30 |
| ISBN: | 978 0 580 84243 6 |
| Status: | Standard |
BS EN 60063:2015
This standard BS EN 60063:2015 Preferred number series for resistors and capacitors is classified in these ICS categories:
- 31.060.01 Capacitors in general
- 31.040.01 Resistors in general
This 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 .
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.