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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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 The significantly updated IEC Originally meant also as part marking codethis shorthand notation is widely used in ief engineering to denote the values of resistors and capacitors in circuit diagrams and in kec production of electronic circuits for example in bills of material and in silk screens.
This method avoids overlooking the decimal separatorwhich may not be rendered reliably on components or when duplicating documents.
The standards also define a color code for fixed resistors. For brevity, the notation omits to always specify the unit ohm or farad explicitly and instead relies on implicit knowledge raised 600062 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 notation also avoids using a decimal separator and replaces it by a letter associated with the prefix symbol for the particular value. 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.
The code letters are loosely related to the corresponding SI prefixbut there are several exceptions, eic the capitalization differs or alternative letters are used. For example, 8K2 indicates a resistor value of 8.
Additional zeros imply tighter tolerance, for example 15M0. 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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For example, 1R2 indicates 1. 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. 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 isc mega. Similar, the standard prescribes the following lowercase letters for capacitances to be used instead of the decimal point: 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.
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Today, a lowercase letter m should be used for capacitances whenever possible to avoid confusion. 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. It may therefore cause confusion in some contexts. 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.
Archived from the original on Archived PDF from the original on Date codes for and are obviously wrong.
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