Measurement Process

Efficiency Testing and Data for the ecoPSU Database

Since ecoPSU will combine data from different sources, a simple and open testing-guidelines needs to be adopted. Data for the ecoPSU database must contain all necessary values declared in EU regulation No. 617/2013 to display the results in test reports.

Testing guidelines of ecoPSU should conform to the “commission communication in the framework of the implementation of Commission Regulation (EU) No. 617/2013 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for computers and computer servers” – “Publication of titles and references of transitional methods of measurement for the implementation of Regulation (EU) No 617/2013” published in the official journal of the European Union as Commission Communication 2014/C 110/05 (current Version from April 11th, 2014). For latest details on required testing procedure please check

The methods of measurement stipulated by the European Commission lack some clarity in the details, as of this day norms are still preliminary. For example the document says that testing shall be conducted with 230 V current and 60 Hz frequency. This is a typing error in the document and will be changed to 230 V and 50 Hz in the next revision. ecoPSU is in close contact with market surveillance and EU authorities to achieve clarity and adapt its guidelines to regulation changes once these will be implemented by the EU.

Testing of the power supplies may be carried out in qualified testing labs by ecoPSU staff or by independent third partys following standards for efficiency testing of power supplies. If power supplies are tested by ecoPSU itself, will use accurate professional testing equipment designed for efficiency measurement of power supplies. Usually testing equipment consists of Chroma AC Source, Chroma DC Loads, Chroma power meter or equivalent standard equipment to assure accurate testing within the regulation’s requirements.

Since equipment and methodology can have a significant impact on results of efficiency measurements and since ecoPSU uses different data sources, we do not claim to reach the highest  possible „precision“. Because of sample and testing variations a single measurement is most of the time not representative. Therefor ecoPSU tries to integrate a large amount of measurements and data sets to increase the informative value.

sample selection for ecoPSU

ecoPSU will always prefer the use of fully random samples from mass production for testing and data acquisition. They may be random picks from the manufacturer’s warehouse or picks from local retail stores or distribution. Since it is not always possible to obtain such samples in an early stage of production, there are ways to provide data of pre-mass-production samples (often also press samples fall into this category). In any case pre-samples have to be identical in construction to the final retail product. In particular samples may not vary in aspects that have influence on the PSUs efficiency, such as different cables, cable length, fan type or fan rotation speed or others aspects. 

All Samples will be recorded with serial numbers (if available), type and source to allow tractability and transparency of sample selection. To avoid golden sampling or cherry picking ecoPSU will do random incognito tests in each PSU series to assure that the data in our database does not only represent a special batch of the production, since PSUs components may always change over time. Changes of a PSU that may have significant impact on the efficiency, will require a retest of the new batch and new data set. To keep data accurate we encourage manufacturers to conduct regular self testing and quality control. This will also avoid wrong data as a result of golden samples.

Due to product variation it is always possible that random samples ins spot tests may not proof a previous efficiency measurements. In this case ecoPSU will first contact the client in order to discuss the consequences. Since Regulation (EU) No 617/2013 also provides a procedure for retesting in case a product fails efficiency criteria, ecoPSU will adapt to these rules.

If retesting of samples fails after all, labels of the product need to be changed or removed.  In extreme cases the data stored in our database will become invalid, marked as outdated or will be completely deleted.