Industrial process control systems - Part 2: Methods of evaluating the performance of intelligent valve positioners with pneumatic outputs mounted on an actuator valve assembly (IEC 61514-2:2013) (english version)
Electricity metering equipment (AC) - General requirements, tests and test conditions -- Part 21: Tariff and load control equipment (IEC 62052-21:2004 + A1:2016) (english version)