Comparison of non-quantum methods for calibration of digital sources of very-low-frequency AC voltage

The paper presents methods of calibration of digital sources of AC voltage with very low frequency (0.001 - 100 Hz) and of effective value from 1 V to 7 V. The work deals primarily with calibration methods of digital sources of the sinusoidal signal which is approximated with the staircase waveform. Calibration methods are divided into dynamic and static. Of the dynamic methods the thermal method and integrating sampling method is described. Of the static methods the step and the peak-to-peak method of calibration is presented. The potential applications, basic features and accuracy of all the methods are discussed. The paper also contains a comparison of results obtained by means of presented methods of calibration.