Rotating electrical machines: Part 2 method of tests: Sec 1 standard methods for determining losses and efficiency from tests (Excluding Machines For Traction Vehicles)
Direct acting indicating analogue electrical measuring instruments and their accessories Part 1: Definitions and general requirements common to all parts Fifth Revision
Direct acting indicating analogue electrical measuring instruments and their accessories Part 5: Special requirements for phase meters power factor meters and synchroscopes
DIRECT ACTING INDICATING ANALOGUE ELECTRICAL MEASURING INSTRUMENTS AND THEIR ACCESSORIES Part 6: Special requirements for ohmmeters impedance meters and conductance meters