IEC 60151-4:1963 pdf download,Measurements of the electrical properties of electronic tubes and valves – Part 4: Methods of measuring noise factor.

IEC 60151-4:1963 presents principles and methods for measuring the noise factor of electronic tubes and valves. Noise factor indicates how much a device degrades the signal-to-noise ratio of an input signal, making it an important characteristic for radio receivers, amplifiers, communication equipment, and other low-level, high-frequency circuits.

The document describes the general measurement concept: applying a known signal and noise condition to the tube or valve, observing the resulting output signal-to-noise ratio, and determining the additional noise introduced by the device. It addresses suitable test arrangements, noise sources, signal levels, operating points, frequency conditions, impedance matching, shielding, grounding, bandwidth, and measurement instruments. These factors are essential because tube noise can be affected by electrode voltages, cathode temperature, load impedance, frequency, and the surrounding circuit.

The standard provides a technical framework for evaluating and reporting noise-factor measurements, including identification of the tube, operating conditions, test frequency, circuit configuration, and relevant corrections. However, it is based on measurement practice of its time and should not be treated as a complete precision standard: more detailed procedures are required when results must be comparable within specified tolerances.

Overall, IEC 60151-4:1963 supports laboratory characterization, type testing, production inspection, research, equipment design, and comparison of electronic valves, while promoting consistent interpretation of noise performance under controlled test conditions.