Research of long-time stability of an atomic magnetic resonance standard system for reproduction of direct current and magnetic flux density

摘要

At the D. I. Mendeleyev Institute for Metrology (VNIIM) a standard system using helium-4 atomic magnetic resonance is operating during 10 years for reproduction of low magnetic flux density and direct current. Researches of the base elements of this system for last 5 years have shown that non-stability of the coil-constant of a standard solenoid and nonlinearity of the frequency-to-current conversion coefficient of a quantum system for current reproduction in the range 0.1 A to 1 A are less than 1×10{sup}(-7).