BS 1852

The British standard BS 1852[1] and its replacement, BS EN 60062,[2][3] comprises a colour code for fixed resistors; letter and digit code for resistance (R for ohms, K for kilohms and M for megohms) and capacitance values.

Codes

Letter code for resistance and capacitance tolerances and a date code for capacitors and resistors:

coding:

BB - 1/8 WATTS,
CB - 1/4 ″ ,
EB - 1/2 ″ ,
GB - 1/1 ″ ,
5 - ±5% tolerance,
2 - ±20% ″,
1 - ±10% ″,

Steps to find out the resistance or capacitance values:

  1. 1st 2 letters gives the power dissipation capacity.
  2. next 3 digits gives the resistance value.
    1. 1st 2 digits are the significant values
    2. 3rd digit is the multiplier.
  3. final digit gives the tolerance.

Examples

If a resistor is coded :

Examples of resistance values
R47 0.47 ohm
4R7 4.7 ohm
470R 470 ohm
4K7 4.7 kilohm
47K 47 kilohm
47K3 47.3 kilohm
470K 470 kilohm
4M7 4.7 megohm

References

  1. BS 1852:1975, IEC 60062:1974
  2. BS EN 60062:1994
  3. BS EN 60062:2005


This article is issued from Wikipedia - version of the Saturday, January 04, 2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.