BS EN 60051-1. Direct acting indicating analogue electrical measuring instruments and their accessories. Part 1. Definitions and general requirements common to all parts|Electrical measuring instruments, Signal devices, Analogue signals, Ammeters, Voltmeters, Wattmeters, Varmeters, Ohmmeters, Frequency measurement, Phase measurement (electric), Power measurement (electric), Impedance measurement, Electrical measurement, Instrument shunts, Resistors, Accessories, Classification systems, Conformity, Accuracy, Errors, Testing conditions, Tolerances (measurement), Working range, Magnetic fields, Electrical testing, Damping, Response time, Heating tests, Temperature, Instrument scales, Indicating device components, Vibration testing, Impact testing, Marking, Symbols