State system for ensuring the uniformity of measurements. State verification schedule for instruments measuring the ratio error and phase displacement of a.c. power frequency voltage in the range from 0,1/V3 to 750/V3 kV
State system for ensuring the uniformity of measurements. Medical ultrasonic therapeutic equipment. General requirements for measurement procedures of the acoustic output performance in the frequency range from 0,5 MHz to 5,0 MHz
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