IEEE 10-2016 pdf free.American National Standard for Metric Practice.
When the metric system developed in the 19th century. all educated persons were thmi liar with the Greek alphabet, and the Greek letters lowercase mu (for micro) and uppercase omega (for ohm) were standardized and have been included in the official SI Brochure. This present.s a problem now with limited character sets, especially in embedded and applied computer operating systems used in manufacturing and labware. IIiEF SW 260.l-20O4 IB9J addresses this problem and prescribes lowercase u as a substitute prefix symbol for micro and Ohm (note the uppercase 0) as a substitute unit symbol for ohm when Greek letters are not available, It also gives recommendations where only uppercase or only lowercase letters are available.
SI is the form of the metric system that shall be used for all applications. It is important that this modem form of the metric system be thoroughly understood and properly applied. The remainder of this standard gives guidance concerning the use of the syslem. including the limited number of cases in which units outside Si are appropriately used, and makes recommendations concerning usage and style.
In general, use the SI prefixes (see 2.2) to indicate orders of magnitude. Thus, one can eliiiiinate nonsignificant digits (for example. 12300 m becomes 12.3 kin, or 12.30 km. or 12,300 km depending on the appropriate number of significant digits) and leading zeros in decimal fractions (for example, 0.001 23 pm becomes 1.23 nrn). SI prefixes provide a convenient alternative to the powers-of-ten notation (for example. 12.3 x m becomes 12.3 kin). Never use a prefix alone.
When expressing a quantity by a numerical value and a unit, give preference to a prefix that yields a numerical value between 0.1 and 1000. For simplicity, give preference to prefixes representing 1000 raised to a positive or negative integral power. However, the following factors may justify deviation from these prefixes:
a) In expressing area and volume, the prefixes hecto. deka. deci. and centi may be convenient, for example, cubic decimeter, square hectometer. or cubic centimeter.
b) In tables of values of the same quantity, or in a discussion of such values within a given context, it is preferable to use the same unit multiple or submultiple throughout.IEEE 10 pdf free download.