BS 4319-1 1968 Edition, April 30, 1968
Methods of Measurement of the electrical properties of electronic tubes and valves (Excluding microwave devices) - Part 1: Essential conditions for measuring equivalent input and output admittances
Includes all amendments and changes through Reaffirmation Notice , June 1, 2016
Published By:British Standards Institution (BSI)
Gives conditions but not measuring methods. Other parts will cover terminology, theory, measuring conditions, basic circuits, and methods of measurement.