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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 EA750G Pro'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	21.0mV	15.7mV	14.9mV	5.3mV	Pass
20% Load	29.6mV	15.4mV	12.5mV	6.1mV	Pass
30% Load	34.9mV	17.7mV	16.3mV	7.3mV	Pass
40% Load	38.5mV	18.6mV	18.3mV	8.1mV	Pass
50% Load	33.3mV	17.9mV	18.1mV	8.6mV	Pass
60% Load	32.4mV	19.5mV	16.8mV	9.4mV	Pass
70% Load	33.0mV	20.8mV	14.9mV	9.7mV	Pass
80% Load	35.3mV	21.7mV	18.7mV	10.7mV	Pass
90% Load	37.9mV	22.8mV	19.1mV	11.6mV	Pass
100% Load	44.0mV	23.6mV	19.1mV	12.4mV	Pass
110% Load	52.3mV	23.9mV	19.0mV	12.6mV	Pass
Cross-Load 1	27.9mV	21.3mV	17.5mV	7.4mV	Pass
Cross-Load 2	44.7mV	19.9mV	18.3mV	11.3mV	Pass

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Measured ripple suppression isn't up to the levels that we usually see from Seasonic's platforms. However, this is a budget-oriented PSU, so we can't be quite as picky.

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.