Transient Testing

For those of you that are curious as to some of the reasoning and equipment behind our PSU testing program here at TheFPSReview, we have put together an introduction for you that shares a lot of the behind the scenes of the program. This program is based on what the author developed at [H]ardOCP and utilizes the equipment bequeathed to the author by Kyle Bennett. The testing we are conducting today is exactly as described in that document and will continue with our Transient Testing.

Transient Test 1

Loaded/Unloaded

12v/5v

Test #1 is equal to approximately 25% of the rated capacity of the SilverStone ST1000-PTS at 45c. This makes Test #1 equal to 264W by loading the 12v rail to 20a, the 5v rail to 2a, the 3.3v rail to 1a, the +5vsb to 2a, and the -12v to 0.3a before the addition of the transient load. The results of Test #1 show a ~520mV drop on the 12v rail and ~120mV drop on the 5v rail when each is directly loaded. At the same time that the load was being triggered on the 12v rail, the 5v rail measured a ~110mV drop.

Transient Test 2

Loaded/Unloaded

12v/5v

Test #2 is equal to approximately 50% of the rated capacity of the SilverStone ST1000-PTS at 45c. This makes Test #2 equal to 484W by loading the 12v rail to 38a, the 5v rail to 3a, the 3.3v rail to 2a, the +5vsb to 2a, and the -12v to 0.3a before the addition of the transient load. The results of Test #2 show a ~360mV drop on the 12v rail and ~105mV drop on the 5v rail when each is directly loaded. At the same time that the load was being triggered on the 12v rail, the 5v rail measured a ~100mV drop.

Transient Load Testing Summary

The Transient Load Tests results for the SilverStone ST1000-PTS are passing. In today’s testing, the ST1000-PTS saw the loaded 12v rail post a peak change of ~520mV and the loaded 5v rail post a peak change of ~120mV. The unloaded 5v peak change during the 12v load was ~110mV. Those numbers are passing in an absolute sense, but they are not what we would call excellent (not least of which because this is a 1000W unit and in Test #1 the 12v rail hit the bottom of the ATX12v specification range). Given how large these changes are this unit is not likely to be among the top of its class in a relative sense, but it does pass our testing and that is a good first step. Let’s move on now to see how this unit does in the DC Output Quality aspect of our testing!

 

 

Paul Johnson

Paul is a long time PC hobbyist and tech enthusiast having gotten his start when he broke his first C64 quickly followed by breaking his first IBM XT. Most notably however, for 12 years, he served as the...