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This paper introduces a method for characterizing the current noise ofcommercial constant-current sources(CCSs) using a free-induction-decay(FID)type optically-pumped rubidium atomic magnetometer driven by aradio-frequency(RF) magnetic field. We convert the sensitivity of the atomicmagnetometer into the current noise of CCS by calibrating the coil constant. Atthe same time, the current noise characteristics of six typical commerciallow-noise CCSs are compared. The current noise level of the KeySight ModelB2961A is the lowest among the six tested CCSs, which is 36.233 0.022 nA /Hz1/2 at 1-25 Hz and 133.905 0.080 nA / Hz1/2 at 1-100 Hz respectively. Thesensitivity of atomic magnetometer is dependent on the current noise level ofthe CCS. The CCS with low noise is of great significance for high-sensitivityatomic magnetometer. The research provides an important reference for promotingthe development of high precision CCS, metrology and basic physics research.

Characterizing current noise of commercial constant-current sources by using of an optically-pumped rubidium atomic magnetometer