<page_title> Conventional electrical unit </page_title> <section_title> Definition </section_title> <table> <cell> Josephson constant <col_header> Constant </col_header> </cell> <cell> KJ-90 = 483597.9 GHz/V <col_header> Conventional exact value (CIPM, 1988; until 2018) </col_header> </cell> <cell> von Klitzing constant <col_header> Constant </col_header> </cell> <cell> RK-90 = 25812.807 Ω <col_header> Conventional exact value (CIPM, 1988; until 2018) </col_header> </cell> </table>
In 1988, the CIPM conventional values for the Josephson constant as exactly KJ-90 = 483597.9×10⁹ Hz/V and for the von Klitzing constant as exactly RK-90 = 25812.807 Ω.