The methods given here include measurements, as made with either indicating or integrating instruments, of power, voltage and current in direct current and alternating-current single-phase and polyphase rotating machinery, transformers, induction apparatus, arc and resistance heating equipment and mercury rectifiers. It also includes measurements made with supplementary instruments and devices. This code does not include such measurements as resistance and temperature which are often included in determining the performance characteristics of electric machinery. Instruments for these latter measurements will be found in the specific codes dealing with the particular measurement; such as AIEE Master Test Code for Temperature Measurement, No. 551.

It is the purpose of this code to give instructions for those measurements of electrical quantities which are commonly needed in deter mining the performance characteristics of electric machinery and equipment. The choice of method and instruments to be used in any given case depends on the purpose of the measurement, the accuracy required, the time and testing equipment available and the nature of the circuit to be measured.