To learn how we measure ripple, please click here.
The following table includes the ripple levels we measured on the PR-GP1200FM’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).
|10% Load||7.9 mV||5.7 mV||10.0 mV||6.1 mV||Pass|
|20% Load||10.4 mV||5.9 mV||11.1 mV||5.9 mV||Pass|
|30% Load||11.0 mV||6.5 mV||12.3 mV||6.6 mV||Pass|
|40% Load||11.2 mV||7.1 mV||13.7 mV||7.1 mV||Pass|
|50% Load||12.1 mV||8.1 mV||15.0 mV||7.8 mV||Pass|
|60% Load||11.6 mV||9.3 mV||17.2 mV||8.5 mV||Pass|
|70% Load||12.7 mV||9.5 mV||19.1 mV||8.2 mV||Pass|
|80% Load||13.6 mV||11.0 mV||22.9 mV||10.0 mV||Pass|
|90% Load||13.4 mV||11.2 mV||24.8 mV||10.8 mV||Pass|
|100% Load||23.8 mV||11.0 mV||27.1 mV||11.8 mV||Pass|
|105% Load||16.6 mV||12.7 mV||24.5 mV||12.1 mV||Pass|
|Crossload 1||11.2 mV||7.4 mV||21.3 mV||7.6 mV||Pass|
|Crossload 2||23.2 mV||12.4 mV||23.0 mV||12.2 mV||Pass|
The ripple suppression is pretty good on all rails. Please do note that with 105% load we measure less ripple because we conducted this test at a much lower temperature compared to the 100% test. We were forced to do this because the PSU kept shutting down with anything higher than 100% of its max rated capacity, under high operating temperatures.
Ripple Oscilloscope Screenshots
The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.