Ripple Measurements
To learn how we measure ripple, please click here.
The following table includes the ripple levels we measured on the SSR-750FX's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).
Test | 12V | 5V | 3.3V | 5VSB | Pass/Fail |
---|---|---|---|---|---|
10% Load | 8.9mV | 6.0mV | 8.2mV | 5.7mV | Pass |
20% Load | 12.7mV | 6.1mV | 8.5mV | 5.9mV | Pass |
30% Load | 15.2mV | 6.3mV | 8.5mV | 6.1mV | Pass |
40% Load | 17.1mV | 7.8mV | 10.4mV | 6.5mV | Pass |
50% Load | 18.3mV | 7.8mV | 9.1mV | 6.5mV | Pass |
60% Load | 20.2mV | 10.4mV | 10.6mV | 7.2mV | Pass |
70% Load | 21.9mV | 11.4mV | 11.6mV | 8.4mV | Pass |
80% Load | 23.0mV | 11.6mV | 11.8mV | 9.4mV | Pass |
90% Load | 26.2mV | 13.1mV | 13.1mV | 9.8mV | Pass |
100% Load | 27.9mV | 13.2mV | 14.6mV | 11.6mV | Pass |
110% Load | 28.6mV | 15.4mV | 15.9mV | 12.2mV | Pass |
Cross-Load 1 | 12.3mV | 11.3mV | 9.4mV | 8.2mV | Pass |
Cross-Load 2 | 27.2mV | 10.6mV | 12.8mV | 9.2mV | Pass |
The addition of filtering caps on the modular cables, along with a good overall design, enable impressive ripple suppression. Seasonic still doesn't achieve Super Flower levels, but it'd be silly to complain. Even under 110% load, the +12V rail doesn't exceed 30mV, while the minor rails stay below 16mV in the worst-case scenario.
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.
Ripple At Full Load
Ripple At 110-Percent Load
Ripple At Cross-Load 1
Ripple At Cross-Load 2
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