quote:For example, we may see a few PSUs that perform extremely well, provided you don't exceed certain loads on some of the voltage rails.
quote:To test the quality of the DC output we need an oscilloscope as well. This is important since each output has certain ripple and noise levels, and these are different with each power supply - even those from the same manufacturer. The ripple and noise are leftovers from the electric pulse, and every power supply should implement certain measures to reduce the ripple to an acceptable grade. The actual Power Supply Design Guide specifies that each +12V rail should not have any ripple over 120mV and the +3.3V and +5V rails should not have any ripple over ~50mV. Unfortunately we cannot present these tests right away since we are still working on the best methods. We will conduct those measurements soon and include them in the reviews.
quote:In most parts of the world it is usual to use a grid power of 230VAC with a frequency of 50Hz. In the US, Canada, and parts of South America however the standards are around 117VAC with a frequency of 60Hz (commonly rounded to 120VAC).
quote:Chroma Programmable AC Power Source 61600 Series use DSP technology to program voltage waveform. Users can change the voltage or
frequency in only one step. Or users can set the slew rate to get a gradual increase or decrease of voltage and frequency. It can help users
easily to test the power input range of their products, for example, 90V-264V/47Hz-63Hz.
quote:The bottom line is, a normal PC is just not enough to fully load a high-end power supply, and therefore it cannot be properly tested and surely not approved by such a configuration.