This standard covers the methods of measurement of radio influence voltage in the frequency range of 0.015 to 30 megahertz that may be associated with high-voltage power apparatus used on transmission and distribution systems at line voltages of 0.6 kilovolts and above. The decision as to whether this standard applies to a specific test sample may be determined from the specifications or standards which apply to the equipment in question. The radio influence voltage which is of principal concern in this standard is that voltage appearing at the terminals of test samples, or on conductors of power systems, which affects the coordination between power and communication circuits. Acceptable low level radio influence voltage measured on the terminals of power equipment may not affect the coordination between power systems and communication circuits, but, may be of concern in the life of the equipment's internal insulation. Because of the large voltage range and, consequently, the large change in dimensions of high-voltage test equipment, it is not feasible to define a single standard high- voltage test circuit. The general form of the test circuit is defined, and nominal limits are placed on components of the circuit. In order that uniform and significant radio influence voltage measurements may be made, it is necessary that the test circuits be accurately calibrated as described in this standard. By means of this calibration, the effects of circuit elements and stray circuit constants of the test circuit are taken into consideration.