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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R E [nb 3].
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K k [nb 4]. For example, 8K2 indicates a resistor value of 8.
BS 1852:1975, IEC 60062:1974
The code letters are loosely related to the corresponding SI prefixbut there are several exceptions, where the uec differs or alternative letters are used. 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 60062 notation to specify resistor and capacitor values defined in the international standard IEC formerly IEC 62 since The notation also avoids using a decimal separator and replaces it by a letter associated with the prefix symbol for the particular value.
This section is empty. 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.
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Today, a lowercase letter m should be used for capacitances whenever possible to avoid confusion. Similar, the standard prescribes the following lowercase letters for capacitances to be used instead of the decimal point: From Wikipedia, the free encyclopedia.
For example, 1R2 indicates 1. Archived from the original on The standards also define a color code for fixed resistors.
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.
Archived PDF from the original on However, the letter E is conflictive with 600062 similar looking but incompatible E notation in engineering, and it may therefore cause considerable confusion as well.
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. Additional zeros imply tighter tolerance, for example 15M0. 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.
The significantly updated IEC Date codes for and are obviously wrong. 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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The letters G and T weren’t part of the first issue of the standard, which pre-dates the introduction of the 6062 system hence the name “RKM code”but were added after the adoption of the corresponding SI prefixes.
It may therefore cause confusion in some contexts. When the value can be expressed without the need for a prefix, an “R” is used instead of the decimal separator.
RKM code – Wikipedia
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