These resources focus on the basic concepts, methods, and instrumentation for ac current and voltage measurements.
AC Measurement Considerations explains how ammeters and voltmeters make ac measurements. Circuit loading, waveform distortion and other measurement issues are discussed.
AC Current Measurement Methods covers the popular methods for sensing AC current (shunt, current transformer, Hall sensor, Rogowski coil).
AC Current Instrumentation reviews some of the instruments available for fixed, portable, local and remote AC current measurements.