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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).

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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

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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.