Ripple Measurements
You will see the ripple levels that we measured on the main rails of the Tesla R2 1000 W in the following table. The limits are 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB) according to the ATX specification.
Ripple Measurements Fractal Design R2 1000W |
---|
Test | 12 V | 5 V | 3.3 V | 5VSB | Pass/Fail |
20% Load | 15.6 mV | 14.4 mV | 15.6 mV | 17.7 mV | Pass |
40% Load | 21.9 mV | 18.5 mV | 19.2 mV | 19.5 mV | Pass |
50% Load | 26.0 mV | 20.8 mV | 20.7 mV | 22.7 mV | Pass |
60% Load | 30.9 mV | 22.3 mV | 24.1 mV | 23.2 mV | Pass |
80% Load | 37.4 mV | 26.5 mV | 27.7 mV | 27.2 mV | Pass |
100% Load | 51.0 mV | 41.8 mV | 34.6 mV | 31.5 mV | Pass |
110% Load | 62.9 mV | 40.2 mV | 36.7 mV | 33.0 mV | Pass |
Crossload 1 | 19.8 mV | 18.6 mV | 23.2 mV | 20.2 mV | Pass |
Crossload 2 | 46.6 mV | 29.9 mV | 27.9 mV | 27.1 mV | Pass |
Ripple suppression at +12V is fairly good for a unit of this category. If this was a high-end PSU, we would want to see ripple below 40 mV on the same rail; ideally under 30 mV. Ripple on the minor rails is kept at fairly good levels up to the 80% test, but it increases significantly during the full-load test, with 5V taking most of the hit. Sure, the limit is still a ways away, but we would like to see better ripple suppression on these rails. That said, the R2 1000 W still managed to outperform its high-end sibling (the R3 1000 W) in these tests.
Ripple at Full Load
You can see the AC ripple and noise that the main rails registered (+12V, 5V, 3.3V, and 5VSB) in the following oscilloscope screenshots. The bigger the fluctuations on the oscilloscope's screen, the bigger the ripple/noise. For all measurements, we set 0.01 V/Div (each vertical division/box equals 0.01 V) as standard.
Ripple at 110% Load
Ripple at Crossload 1
Ripple at Crossload 2