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The Pt100 ohm standard refers to IPTS-68, ITS-90, and JPt100 ohm. What is the difference between these?

April 26, 2017difference ipts-68 its-90 jpt100 ohm PT100 standard

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The Pt100 ohm standard refers to IPTS-68, ITS-90, and JPt100 ohm. What is the difference between these?

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IPTS-68: An international standard from 1968 in which R100/R0=1.2850. JIS adopted the standard between 1989-1997, but it is not presently used. ITS90: An international standard from 1990 in which R100/R0=1.3851. JIS has adopted the standard from 1997 to the present. JPt100 is a Japanese standard that was cancelled in 1989, in which R100/R0=1.3916.