GOST R 8.648-2008 State system for ensuring the uniformity of measurements. State verification schedule for instruments measuring of alternate electrical voltage to 1000 V in the frequency range from 1·10 in minus 2 degree up to 2·10 in 9 degree Hz
2015GOST R 8.648-2015 State system for ensuring the Uniformity of measurements. State verification schedule for measuring instruments of alternate electrical voltage to 1000 V in the frequency range from 1·10-2 to 2·10-9 Hz
2008GOST R 8.648-2008 State system for ensuring the uniformity of measurements. State verification schedule for instruments measuring of alternate electrical voltage to 1000 V in the frequency range from 1·10 in minus 2 degree up to 2·10 in 9 degree Hz