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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 HCG850’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	9.7mV	6.5mV	8.8mV	5.3mV	Pass
20% Load	13.5mV	7.3mV	9.3mV	5.5mV	Pass
30% Load	15.8mV	7.8mV	9.6mV	5.7mV	Pass
40% Load	17.6mV	9.2mV	9.7mV	5.7mV	Pass
50% Load	18.0mV	10.1mV	8.7mV	5.6mV	Pass
60% Load	15.9mV	10.8mV	9.8mV	6.6mV	Pass
70% Load	16.3mV	11.4mV	10.8mV	7.0mV	Pass
80% Load	17.9mV	12.0mV	10.9mV	9.6mV	Pass
90% Load	20.5mV	12.5mV	10.6mV	9.9mV	Pass
100% Load	24.4mV	13.0mV	12.4mV	9.7mV	Pass
110% Load	26.2mV	13.4mV	13.4mV	10.1mV	Pass
Cross-Load 1	10.5mV	11.5mV	9.6mV	5.7mV	Pass
Cross-Load 2	24.0mV	8.6mV	11.0mV	8.2mV	Pass

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Ripple suppression is great on every rail thanks to an expertly designed secondary side and in-cable capacitors.

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.