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 What is BS EN 3943-

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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 What is BS EN 3943-1 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