Abstract
This chapter discusses measurements on AF amplifiers. The measurements required to be made on amplifiers are gain and amount of distortion introduced. The conditions are somewhat different in the two cases of pure voltage amplification and what is generally called power amplification, but the general principles of measurement are the same. In measuring the overall gain of an amplifier, the voltage input required to produce a given power output is found. The power output is measured by a thermocouple or rectifier milliammeter. The thermal milliammeter gives an indication of the actual power dissipated in the load, irrespective of waveform, whereas the rectifier meter reads the average value of the current and, therefore, only gives a correct power indication for sinusoidal waveform. For most purposes, the gain of an amplifier is measured under distortion-less conditions with a pure sine-wave input. Consequently, it is not important from a theoretical point of view which method of indication is employed. The thermal meter is more accurate, but the rectifier type is much more robust and is, therefore, one that is most used.
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