Applies to the measurement of partial discharges which occur in electrical apparatus, components or systems when tested with alternating voltages up to 400 Hz or with direct voltage. Defines the quantities to be measured and describes test and measuring circuits which may be used. It is intended that the provisions of this Standard should be used in the drafting of specifications relating to partial discharge measurements for specific power apparatus. This Standard is identical to and has been reproduced from IEC 60270:2000.