IEC Edition INTERNATIONAL. STANDARD. NORME. INTERNATIONALE. Marking codes for resistors and capacitors. Codes de marquage. Fifth edition. Marking codes for resistors and capacitors. Reference number. IEC (E). This is a free 5 page sample. Access the full. IEC MARKING CODES FOR RESISTORS AND CAPACITORS.
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Views Read Edit View history. You can help by adding to it. The significantly updated IEC The notation also avoids using a decimal separator and replaces it by a letter associated with the prefix symbol for the particular value. This page was last edited on 21 Augustat 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.
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 oec Articles with empty sections from December All articles with empty sections Articles using small message boxes. This is iecc 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.
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It may therefore cause confusion in some contexts. For example, 8K2 indicates a resistor value of 8. This method avoids overlooking the decimal separatorwhich may not be rendered reliably on components or when duplicating documents. 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 K k [nb 4].
Archived PDF from the original on For 6062, 1R2 indicates 1. 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[nb 2] a part’s appearance, and the context. From Wikipedia, the free encyclopedia.
However, the letter E is conflictive with the similar looking but incompatible E notation in engineering, and it may therefore cause considerable confusion as well. Retrieved from ” https: This section is empty.
When the value can be expressed without the need for a prefix, an “R” is used instead of the decimal separator.
Today, a lowercase letter m should be used for capacitances whenever possible to avoid confusion. 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.
Date codes for and are obviously wrong. Additional zeros imply tighter tolerance, for example ic. R E [nb 3]. List of International Electrotechnical Commission standards.
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Archived from the original on The standards also define a color code for fixed resistors. Similar, the standard prescribes the following lowercase letters for capacitances to be used instead of the decimal point: 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.
The letters G and T weren’t part of the first issue of the standard, which pre-dates the introduction of the SI system hence the name “RKM code”but were added after the adoption of the corresponding SI prefixes. 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.