Tolerance Of Resistor Value

More online conversion calculators at digi key. This means the tolerance has a default value of plus or minus 20 percent.

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Standard resistor values 5 10 10 100 10k 10k 100k 10m 11 11 110 11k 11k 110k 11m 12 12 120 12k 12k 120k 12m 13 13 130 13k 13k 130k 13m.

Tolerance of resistor value. The resistor color code calculator decodes and identifies a value and tolerance of 4 band wire wound resistors. The correct tolerance limits should be 1998k 2002k. Tolerance is the percentage of error between the actual measured resistive value and the stated value.

For example a 1kw 20 tolerance resistor may have a maximum and minimum resistive value of. The tolerance of a resistor is the deviation that a resistor may vary from its nominal value resistance measured at 250c with no load applied. 1 the resistor color code and the eia preferred values are internationally accepted standards but some manufacturers have their own way of doing things.

In 1952 the iec international electrotechnical commission decided to define the resistance and tolerance values into a norm to ease the mass manufacturing of resistors. The tolerance of a resistor is the maximum difference between its actual value and the required value and is generally expressed as a plus or minus percentage value. In other words the resistor tolerance is the amount by which the resistance of a resistor may vary from its stated value.

For example a 1k ohm resistor would have an actual value that measures from 800 to 1200 ohms since the tolerance would be 200 ohms. If you calculate a 200k resistor with a tolerance of 01 the calculator will give a tolerance floor of 180k and a ceiling of 220k which is correct for 10 tolerance not 01. These are referred to as preferred values or e series and they are published in standard iec 600631963.

Some resistors have only three bands on their outer casing which means that the tolerance band is blank. This is due to the manufacturing process and it is expressed as a percentage of its preferred value. For example many resistor manufacturers make every single value on the e24 list in 1 and 2 tolerance even though the practice makes little mathematical sense.

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