Equipment for testing stability of the standard cells emf on the basis of the Josephson effect

Conclusion

The equipment developed for testing the stability of standard cells on the basis of the Josephson's effect is suitable for detecting absolute variations in the SS emf of the order of 0.1 μV, and this exceeds considerably the potentialities of the now existing method based on the application of current balances. It is assumed that sensitivity can be raised by increasing up to 10 mV the voltage across a single Josephson unit or across several of them connected in series. Thus, there exists an actual possibility of producing a new voltage standard with a relative instability in reproducing the values of unit voltages of the order of 5·10⁻⁷% and a reproduction error determined by the precision in calculating the value of the magnetic field quantum h/2e and by other physical constants (i.e., of the order of 5·10⁻⁵%).