Applicable to all types of resistive potentiometers, including lead-screw actuated types, presets, multi-turn units, etc. to be used in electronic equipment. Establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications for Qualification Approval and Quality Assessment Systems for electronic components. Has been mainly written, and the test methods described, to conform with the widely used single turn rotary potentiometer with a control spindle. Supersedes IEC 60393-1 (1973), 60393-1A (1977), 60393-1B (1978) and 60393-1C (1979).