Abstract: A process and a device are useful for calibrating measurement sections for measuring noise field strengths of electrical appliances and/or to determine calibration factors for measurements of noise field strengths by means of the frequency spectrum, in particular up to 1 GHz. To this end, fields are generated by the comb generator in a known reference measurement section, preferably a standard measurement section or a free-field test site, and in a measurement section to be measured with a single calibration device or with a single interference emitter having, in particular, the same operating parameters. These fields are measured in the same manner and the calibration factors are calculated in function of the frequency by comparing the measured values.