Primary and Secondary EMF Standards

EMF measurements are one of the least accurate within the metrology of physical magnitudes. While many of the latter, for instance frequency, are measured with inaccuracy below e-10, in the case of the former the inaccuracy on the level of 1 dB is as accepted as the best, but only in the case of the far field measurements and inaccuracy on the level of 3 dB, or even 6 dB in the near field measurements is very of the to be accepted. Apart from other factors limiting accuracy of the measurement one of the most important of them is inaccuracy (class) of the EMF standards applied for their calibration. The activities in the field of EMF standards are presented