Abstract: : Due to the influence of stray current, when measuring the lower section of a multi-section MOA without disconnecting the primary leads, the measurement results exhibit significant errors. Through experiments, the source of stray current was identified, and its magnitude was measured. Based on this, it is proposed to adopt a method of adding a shield on the surface of the low-voltage flange to shield the stray current and reduce measurement errors. Finally, the feasibility of the low-voltage shielded flange current method was verified through field tests.