The objective of this white paper is to specify a standard, how to determine efficiency  of AC-DC and DC-DC power supply units (PSU) accurately and comparably. Thermal steady state is assumed unless stated otherwise.

Deviating measurements result either from random or systematic error. Random errors mainly in the device under test (DUT) are caused by unknown and unpredictable parameters like parts tolerances, which can mostly be described by a Gaussian normal distribution. By referring to a reference DUT, random errors can be neglected in this guide.

The focus is on minimizing systematic errors like:


Click here for the white paper


Click HERE for the embedded XLS tool “DVM Range Error”


Click HERE for the embedded XLS tool “Shunt resistor Error”


NB:  In Chrome browsers, select ‘download’ to open locally and see all features of the        EXCEL tools

© European Power Supplies Manufacturers’ Association (EPSMA) 2016. All Rights Reserved EPSMA Accurate Efficiency Measurements White Paper -From secretariat 170815- (1).pdf

NEW REVISION IN PROGRESS TO INCLUDE 3- PHASE SYSTEMS, AC-AC and DC-AC

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