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Enermax Platimax D.F. 1200W PSU Review

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the EPF1200EWT's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load12.9mV4.9mV5.3mV4.0mVPass
20% Load19.7mV6.0mV6.9mV5.6mVPass
30% Load28.2mV6.7mV16.5mV8.6mVPass
40% Load32.9mV7.7mV18.3mV10.5mVPass
50% Load39.3mV8.4mV19.4mV12.9mVPass
60% Load29.5mV17.1mV25.7mV20.2mVPass
70% Load29.4mV9.4mV24.2mV14.7mVPass
80% Load32.8mV10.4mV24.9mV16.4mVPass
90% Load35.7mV14.0mV30.0mV21.2mVPass
100% Load39.8mV25.0mV39.0mV33.0mVPass
110% Load45.0mV27.5mV40.4mV48.5mVPass
Cross-Load 115.7mV10.1mV18.8mV5.1mVPass
Cross-Load 239.2mV27.4mV37.0mV34.6mVPass
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For a high-end CWT platform, these ripple suppression numbers don't live up to our expectations. The +12V rail might be close to 40mV at full load, which is quite good, but we're used to seeing less than 30mV (and in some cases less than 20mV) from platforms in this price range.

Worse, the 3.3V rail can't keep its ripple below 30mV. CWT should probably take a look at this rail's voltage regulation module.

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

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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