IEC 60393-1:1989

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).