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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 BF450G’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	13.5mV	7.0mV	6.2mV	9.2mV	Pass
20% Load	22.4mV	6.1mV	5.9mV	9.1mV	Pass
30% Load	24.7mV	6.6mV	6.3mV	10.5mV	Pass
40% Load	22.5mV	6.7mV	7.0mV	10.7mV	Pass
50% Load	21.9mV	7.8mV	7.4mV	11.0mV	Pass
60% Load	24.3mV	8.8mV	8.3mV	11.6mV	Pass
70% Load	26.3mV	10.5mV	10.3mV	12.1mV	Pass
80% Load	25.7mV	14.3mV	15.3mV	18.5mV	Pass
90% Load	26.3mV	16.8mV	18.8mV	19.5mV	Pass
100% Load	29.0mV	13.9mV	15.2mV	21.7mV	Pass
110% Load	27.7mV	13.9mV	14.3mV	25.1mV	Pass
Cross-Load 1	28.0mV	12.6mV	11.5mV	6.4mV	Pass
Cross-Load 2	24.5mV	10.3mV	13.5mV	11.5mV	Pass

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Ripple suppression was very good on every rail. And strangely enough, the ripple at +12V with 110% load decreased slightly; normally we'd expect the opposite. The 3.3V rail also behaves strangely, registering its peak ripple reading with 90% load.

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.