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Email Address. Sign In. IEEE Standard Reference Designations for Electrical and Electronics Parts and Equipments Abstract: This revision added paragraphs on repeated circuits, selected and matched parts, and designation of deposited components on hybrid printed circuits. Supplement A of was incorporated into the text, along with minor clarifications and updating of references. Significant changes are marked by vertical black bars in the margin, adjacent to the changed text.
The original issue of this standard was prepared by Subcommittee 16 on Reference Designations, appointed by Sectional Committee Y32 on Graphic Symbols and Designations for the purpose of preparing standard reference designations in the field of electrical and electronic equipment.
In the U. In order to minimize confusion, intensive and successful efforts have since been made to coordinate the two standards throughout their subsequent revisions. The work on this standard was greatly facilitated by the constant participation of representatives of the Department of Defense and the IEEE Symbols Committee. As in MIL-SfDC, the original Block Numbering Method of assigning reference designations has been deleted in favor of the more flexible and universally applicable Unit Numbering Method, which is retained, with minor modifications, in Section 4 of this standard.
The explanation of the Block Numbering Method appearing as Appendix A does not form a part of this standard, but is retained for reference in connection with existing equipment on which it was used. The subcommittee was assigned the task of standardizing means for physically locating, through a form of reference designation, the parts and divisions of an equipment.
The Location Numbering Method in Section 5 and the Location Coding Method in Section 6 of this standard are based on existing industry practices which have been successfully used to facilitate manufacture and service of complex apparatus by providing such locating means.
They are especially useful in designs making multiple use of identical or closely similar parts of subassemblies. Scope: This standard covers the formation and application of reference designations for electrical and electronics parts and equipment. The reference designations of this standard are intended for uniquely identifying and locating discrete items on diagrams and in a set, and for correlating items in a set, graphic symbols on diagrams, and items in parts lists, circuit descriptions, and instructions.
This standard includes three methods for forming and applying reference designations: the unit number method, the location numbering method, and the location coding method. A complete reference designation may incorporate reference designations formed by the use of any of these methods at any level from basic parts to complete units.
The unit numbering method has a long history of satisfactory use in all types of electrical and electronics equipment. The location numbering method and location coding method have been developed to permit rapid physical location of items in large, complicated equipments featuring multiple use of many identical, or closely similar, items.
These methods shall be applied in such a way that duplicate complete reference designations do not occur in an equipment or system. Device function designations for power switch gear and industrial control use are not covered by this standard.
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A reference designator unambiguously identifies a component within an electrical schematic or on a printed circuit board. The reference designator usually consists of one or two letters followed by a number, e. R13, C The number is sometimes followed by a letter, indicating that components are grouped or matched with each other, e.
An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires , batteries , resistors , and transistors , in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may vary from country to country, or engineering discipline, based on traditional conventions. The graphic symbols used for electrical components in circuit diagrams are covered by national and international standards, in particular:. The number of standards leads to confusion and errors. For example, lighting and power symbols used as part of architectural drawings may be different from symbols for devices used in electronics.
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