IEC 60151-18:1968 Measurements of the electrical properties of electronic tubes. Part 18 : Methods of measurement of noises due to mechanical or acoustic excitations
Definitions relating to the excitation and to the resulting effects are given. Measuring methods and instruments are described. They cover microphonic noise with excitation by tapping and by vibration and show the circuit and block diagram, respectively.
IEC 60151-18:1968 history
1968IEC 60151-18:1968 Measurements of the electrical properties of electronic tubes. Part 18 : Methods of measurement of noises due to mechanical or acoustic excitations