IEEE 10-2016 pdf free download – American National Standard for Metric Practice.
2.2.2 Limited character sets
When the metrw system developed in the 19th century, nil educated persons were familiar with the Greek alphabet, and the Greek leners lowercase mu (for micro) and uppetease onrisi Ifor olani were standardized and liase been included in the official SI Hniehtae. This presents a problem now with latissed character sets, especially in embedded and applied computes opemating syssents used in matiulitciuring and Labware. IEEE Std 260. I 15t2004 [89J addresses this problem and prescribes kswercnt u a-s a substitute prolix srnbssl for micnt arid (thin (note the UfliCrCa’C 0) its S suli-iritute IJTTTI sysraxrt kr 5,IW5 when Gruck ktlcn au isit available It also gives teconanendalions when only uppencase or only kiwercase letters are available
3. Use of the SI
3.1 General
SI is the form of the tnetric system that shall be tased for all applications. It is important that this modern form of the nsecrr system he (borougHs tanderstood and psopeily applied The tensaindes of this standard gives guidance cnncernoig the use of the system. including the limited number of eases in which units outside SI at appropriately used, and makes recxsrnrnendutions concerning usage and style.
3.2 Application of SI prefixes
3.2,1 General
In general, sine the SI prelixex (see 2.2) to indicate orders of magnitude Thus, one can eliminate nonsignificant digits (kit- example. 12 lOt) m becomes 12,3 km. or 12.30 km. or 12300 km depending on the appropriate number of significant digits) and leading zeros in decinasl fractions Ifor example. 0.001 23 tm becomes 123 nrn). SI prefixes provide a eonvenient alternative to the powers-of-ten notation (for example, 12.3 )1 m becomes 12.3 km). Never use a prefix alone.
12.2 Selection
S4hen cspecsamg a quantity by a numerical value and a unit, gisc preference to a prctis that yields a numeric-al 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 are-a and volume, the prefixes bee-to. deka, dcci, and centi may be convenient, for exantple. cubic decimeter, square hectonseter. or ethic centimeter.
b) In tables of values of the attic quantity. at in a discussion of such values within a given context, it is preferable so ate the s-tie unit multiple or submultiple tbniughtsus.
ci For certain qtnntities in particular applications, one particular mstltqsle or submultiple is often used. For example. the mnillinieter is used fot linens dsmcnsmomss in engineeaing dtawings even when the values lie far outside the range of 0.1 mm to 11*10mm; the centimeter ta usually uacd for hotly niessuremnents, clothing sues. hssusehrrld products, and other everyday purposes for which millnneters are inconveniently precise.IEEE 10 pdf download.