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 %.
|Published (Last):||5 February 2018|
|PDF File Size:||10.39 Mb|
|ePub File Size:||19.57 Mb|
|Price:||Free* [*Free Regsitration Required]|
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. The standards also define a color code for fixed resistors.
Electronic color code – Wikiwand
K k [nb 4]. 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 ied for mega. List of International Electrotechnical Commission standards. Views Read Edit View history.
BS 1852:1975, IEC 60062:1974
The code letters are loosely related to the corresponding SI prefixbut there are several exceptions, where the capitalization differs or alternative letters are used. This method avoids overlooking the decimal separatorwhich may not be rendered reliably on components or when duplicating documents. When the value can be expressed without the need for a prefix, an “R” 600062 used instead of the decimal separator.
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.
Today, a lowercase letter m should be used for capacitances whenever possible to avoid confusion. For example, 1R2 indicates 1. Similar, the standard prescribes the following lowercase letters for capacitances to be used instead of the decimal point: Date codes for and are obviously wrong.
You can help by adding to it. The significantly updated IEC For brevity, the notation omits to always specify the unit ohm or farad explicitly and instead relies on implicit ie 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.
Additional zeros imply tighter tolerance, for example 15M0. It may therefore cause confusion in some contexts.
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 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, 8K2 indicates a resistor value of 8. This section is empty. 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. Retrieved from ” https: 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.
Archived from the original on The notation also avoids using a decimal separator and replaces it by a letter associated with the prefix symbol for the particular value. R E [nb 3].