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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 EDT1250EWT'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	15.1mV	7.9mV	5.9mV	5.7mV	Pass
20% Load	23.3mV	8.3mV	6.3mV	7.1mV	Pass
30% Load	31.5mV	9.5mV	7.0mV	9.1mV	Pass
40% Load	35.6mV	10.5mV	7.4mV	10.8mV	Pass
50% Load	41.0mV	11.4mV	8.3mV	12.6mV	Pass
60% Load	32.3mV	12.4mV	9.3mV	13.8mV	Pass
70% Load	33.5mV	13.6mV	10.3mV	15.7mV	Pass
80% Load	29.5mV	15.1mV	10.8mV	16.0mV	Pass
90% Load	27.9mV	14.6mV	11.3mV	17.0mV	Pass
100% Load	30.3mV	17.5mV	14.7mV	21.4mV	Pass
110% Load	32.0mV	16.7mV	12.4mV	20.9mV	Pass
Cross-Load 1	14.4mV	13.2mV	9.0mV	4.9mV	Pass
Cross-Load 2	29.1mV	13.7mV	12.0mV	22.1mV	Pass

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From 30% up to 50% load, we notice an increase in the +12V rail's ripple. But because ripple stays low in all cases, this strange behavior is nothing to worry about. In general, ripple suppression is pretty good; it's just not as good as in Super Flower's or Seasonic's top implementations. Enermax doesn't use in-cable caps like Super Flower does, and we don't see a reason to add them since our measurements are good enough.

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.