The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Josephson constant
 $K_{\rm J}$
 Numerical value  483 597.848 4...  x 109 Hz V-1
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  483 597.848 4... x 109 Hz V-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2022 CODATA     
recommended values 		 Definition of
uncertainty 		      Correlation coefficient with
any other constant

 
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