ANALYSIS OF INTERFERENCES IN LOW-FREQUENCY NOISE MEASUREMENTS
The most essential interferences hampering low-frequency (LF) noise measurements and their impact upon the measurement equipment have been considered and analyzed. The voltages induced on measurement equipment elements by interferences have been estimated. Shielding is considered as a way of interference suppression. Under certain conditions, the LF electric field in the near-field zone decreases faster with distance than the magnetic field. Thus, it is necessary to shield both the electric and magnetic fields. Permalloy has been shown to be a material providing acceptable shielding of electric and magnetic field plane waves.