IEC 60051 is published in separate parts according to the following structure and under the general title Direct acting indicating analogue electrical measuring instruments and their accessories.
Part 1: Definitions and General Requirements Common to all Parts.
Part 2: Special Requirements for Ammeters and Voltmeters.
Part 3: Special Requirements for Wattmeters and Varmeters.
Part 4: Special Requirements for Frequency Meters.
Part 5: Special Requirements for Phase Meters, Power Factor Meters and Synchroscopes.
Part 6: Special Requirements for Ohmmeters (Impedance Meters) and Conductance Meters.
Part 7: Special Requirements for Multi-function Instruments.
Part 8: Special Requirements for Accessories.
Part 9: Recommended Test Methods.
Parts 2 to 9 are not complete in themselves and shall be read in conjunction with this Part 1.
All of these parts are arranged in the same format and a standard relationship between subject and clause number is maintained throughout. This re-arrangement will assist the reader of IEC 60051 to distinguish information relating to the different types of instruments.