GOST 8.551-2013 State system for ensuring the uniformity of measurements. State verification schedule for measuring instruments of electrical power and energy in the frequency range from 1 to 2500 Hz
2013GOST 8.551-2013 State system for ensuring the uniformity of measurements. State verification schedule for measuring instruments of electrical power and energy in the frequency range from 1 to 2500 Hz
1986GOST 8.551-1986 State system for ensuring the uniformity of measurements. State special standard and state verification schedule for means measuring electric power and power factor over the frequency range 40-20000 Hz