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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RKM code – Wikipedia
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.
For example, 8K2 indicates a resistor value of 8.
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This page was last edited on 21 Augustat Archived PDF from the original on Today, a lowercase letter m should be used for capacitances whenever possible to avoid confusion. K k isc 4]. Archived 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 ie capacitor values defined in the international standard IEC formerly IEC 62 since Retrieved from ” https: The standards also define a color code for fixed resistors.
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. This method avoids overlooking iecc decimal separatorwhich may not be rendered reliably on components or when duplicating documents. The introduction of the letter L in more recent issues of the 6006 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.
Additional zeros imply tighter tolerance, isc 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.
For example, 1R2 indicates 1. The letters G and T weren’t part of the 06062 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.
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. However, the letter E is conflictive with the similar looking but incompatible E notation in engineering, and it may therefore cause considerable confusion as 60602.
The code letters are loosely related to the corresponding SI prefixbut there are several exceptions, where the capitalization differs or alternative letters are used. Views Read Edit View history.
The notation also avoids using a decimal separator and replaces it by a letter associated with the prefix symbol for the particular value. When the value can be expressed without the need for a prefix, an “R” is used instead of the decimal separator.
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The significantly updated IEC This section is empty. For brevity, the notation omits to always specify the unit ohm or farad explicitly and instead relies on implicit knowledge 60602 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.
R E [nb 3]. Similar, the standard prescribes the following lowercase letters for capacitances to be used instead of the decimal point: From Wikipedia, the free encyclopedia.