GOST 8.109-1983 State system for ensuring the uniformity of measurements. State primary standard and state verification schedule for means of modulation index of hign frequency oscillations
1997GOST 8.109-1997 State system for ensuring the uniformity of measurements. State verification schedule for means measuring the amplitude modulation factor of high frequency oscillations
1983GOST 8.109-1983 State system for ensuring the uniformity of measurements. State primary standard and state verification schedule for means of modulation index of hign frequency oscillations