Noise field strength

Noise is broadly classified into two types: conducted noise and radiated noise. Among them, radiated noise refers to electromagnetic waves emitted from wiring into the air, and indicates the strength of the electric field. The unit of electric field strength is volts per meter (V/m). When expressing noise electric field strength, decibels (dBμV/m), calculated on a logarithmic scale with 1μV/m as the reference, are used. In order to prevent adverse effects on other electrical and electronic equipment, the noise electric field strength must be kept within the specified standard values, and it is mainly measured using an interference wave measuring instrument (radio wave measuring instrument).