External a.c.. d.c. and a.c.. a.c. power supplies. Determination of no-load power and average efficiency of active modes Ingestion-build-47553 BS EN ISO 12947-2:2016 supersedes

BS EN ISO 12947-2:2016 supersedes BS EN ISO 12947-2:1998 which has been withdrawn

BS 4651-2 guides you with the procedure and expression of results

The standard addresses both risks and opportunities

including in vitro medical devices

fire and wear resistance

External a.c.. d.c. and a.c.. a.c. power supplies. Determination of no-load power and average efficiency of active modes Ingestion-build-47553 BS EN ISO 12947-2:2016 supersedes1 Scope This European Standard specifies methods of measurement of electrical power consumption, and the reporting of results, for external power supplies. This standard is applicable to external power supplies with a rated input voltage within the range 100 V a. c. to 250 V a. c. having a single output with a rated output power not exceeding 250 W and a rated output voltage not exceeding 230 V a. c. or 325 V d. c. The output voltage may be either at