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The paper describes the composition and characteristics of GET 158-2020 State Primary Standard for the electric field strength unit within the frequency range from 0 to 20 kHz. The lower frequency range limit of AC electric field reproduction is extended from 20 Hz to 5 Hz in accordance with regulatory requirements, while the upper limit for the electric field strength (EFS) range amounts to 4000 V/m. The residual systematic error of GET 158-2020 reaches 1.4%; zero electric potential is ensured in the center of a field-generating system. Estimation specifics associated with the symmetric configuration of the standard are considered for the components of residual systematic error and error due to the transfer of the EFS unit, including those associated with the coupling of measuring antennas with the electrodes of field-generating systems. The State Verification Scheme for EFS measuring instruments, taking into account all trends in the development of this type of measurement, was drafted and discussed. [ABSTRACT FROM AUTHOR]

The spectral characteristics of the resonance effect of the electromagnetic-induced transparency (EIT) of rubidium atomic vapors induced by intense radiation with a wavelength in the region from 479 to 486 nm in the presence of microwave radiation at a frequency of 1 to 300 GHz, which splits the energy of transition of the atom from the resonant 5P3/2 states into the Rydberg nD5/2 state, are determined. The magnitude of the splitting of the EIT peak is proportional to the electric field intensity of the microwave radiation. Simple approximation expressions are obtained for the numerical calculation of the transition amplitude between Rydberg nD5/2 and (n + 1)P3/2 states with large principal quantum numbers n. A setup has been developed for measuring the electric field intensity of microwave radiation based on measuring the frequency of splitting of the resonance of an electron microscope in the absorption spectrum of probe radiation. [ABSTRACT FROM AUTHOR]