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The British standard BS 1852 and its replacement, BS EN 60062, 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.
Letter code for resistance and capacitance tolerances and a date code for capacitors and resistors:
- 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:
- 1st 2 letters gives the power dissipation capacity.
- next 3 digits gives the resistance value.
- 1st 2 digits are the significant values
- 3rd digit is the multiplier.
- final digit gives the tolerance.
If a resistor is coded :
- EB1041: power dissipation capacity = 1/2 watts, resistance value = 10×10^4±10% = between 9×10^4 ohms and 11×10^4 ohms.
- CB3932: power dissipation capacity = 1/4 watts, resistance value = 39×10^3±20% = between 46.8×10^3 ohms and 31.2×10^3 ohms.
|Examples of resistance values|
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