OS GSO IEC 60151-13:2014 Measurements of the electrical properties of electronic tubes and valves - Part 13: Methods of measurement of emission current from hot cathodes for high-vacuum electronic tubes and valves
1970OS GSO IEC 60151-13:2014 Measurements of the electrical properties of electronic tubes and valves - Part 13: Methods of measurement of emission current from hot cathodes for high-vacuum electronic tubes and valves