Find the most up-to-date version of IEC at Engineering Fifth edition. Marking codes for resistors and capacitors. Reference number. IEC (E). This is a free 5 page sample. Access the full. 0± F. = 0± E. = 0± 1 2 3 4 = 4 band coding. 15k. Type. According to. IEC According to. IEC 1 2 3 4 5 = 5 band coding. ±1 % = k ±1 %.
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Originally meant also as part marking codethis shorthand notation is widely used in electrical engineering to denote the values of resistors and capacitors in circuit diagrams and in the production of electronic circuits for example in bills of material and in silk screens. Views Read Edit View history. Similar, the standard prescribes the following lowercase letters for capacitances 06062 be used instead of the decimal point: Date codes for and are obviously wrong.
This page was last edited on 21 August ie, at It stems from the fact, that R is used in symbolic names for resistors as well, and it is also used in a similar fashion but with incompatible meaning in other part marking codes.
The introduction of the letter L in more recent issues of the standard instead of an SI prefix m for milli is justified to maintain the rule of only using uppercase letters for resistances the otherwise resulting M was already in use for mega.
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When the value can be expressed without the need for a prefix, an “R” is used instead of jec decimal separator. This is not only for brevity for example when printed on the part or PCBbut also to circumvent the problem that decimal separators tend to “disappear” when photocopying printed circuit diagrams.
For example, 1R2 indicates 1. The standards also define a color code for fixed resistors.
The significantly updated IEC For brevity, the notation omits to always specify the unit ohm or farad explicitly and instead relies on implicit knowledge raised from the usage of specific letters either only for resistors or for capacitors, [nb 1] the case used uppercase letters are typically used for resistors, lowercase letters for capacitors 60602, [nb 2] a part’s appearance, and the context.
Archived from the original on You can help by adding to it. Additional zeros imply tighter tolerance, for example 15M0. The letters p and n weren’t part of the first issue of the standard, but were added after the adoption of the corresponding SI prefixes. The letters G and T weren’t part of the first issue of the standard, which pre-dates the introduction of the 600062 system hence the name “RKM code”but were added after the adoption of the corresponding SI prefixes.
BS , IEC – Specification for marking codes for resistors and capacitors
Today, a lowercase letter m should be used for capacitances whenever possible to avoid confusion. Archived PDF from the original on The RKM code also referred to as “letter and digit code for resistance and capacitance values and tolerances” or “R notation”, is a notation to specify resistor and capacitor values defined in the international standard IEC formerly IEC 62 since CS1 German-language sources de Interlanguage link template link number CS1 Russian-language sources ru Articles to be expanded from December All articles to be expanded Articles with empty sections from December All articles with empty sections Articles using small message boxes.
It may therefore cause confusion in some contexts.
List of International Electrotechnical Commission standards. The notation also avoids using a decimal separator and replaces it by a letter associated with the prefix symbol for the particular value.
K k [nb 4].
BS 1852:1975, IEC 60062:1974
From Wikipedia, the free encyclopedia. For example, 8K2 indicates a resistor value of 8. The code letters are loosely related to the corresponding SI prefixbut there are several exceptions, where the capitalization differs or alternative letters are used. Retrieved from ” https: This section is empty. This method avoids overlooking the decimal separatorwhich may not be rendered reliably on components or when duplicating documents.
However, the letter E is conflictive with the similar looking but incompatible E notation in engineering, ifc it may therefore cause considerable confusion as well. R E [nb 3].