The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Josephson constant
 $K_{\rm J}$
 Value  483 597.870 x 109 Hz V-1
 Standard uncertainty        0.011 x 109 Hz V-1
  Relative standard uncertainty   2.2 x 10-8
 Concise form  483 597.870(11) x 109 Hz V-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2010 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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