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Ripple Measurements

To learn how we measure ripple, please click here.

This table includes the ripple levels we measured on the SPR-0850F-R'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	9.1mV	7.6mV	11.9mV	5.8mV	Pass
20% Load	10.5mV	8.0mV	14.7mV	7.1mV	Pass
30% Load	10.7mV	8.4mV	15.2mV	8.3mV	Pass
40% Load	12.0mV	8.4mV	15.9mV	9.1mV	Pass
50% Load	14.1mV	8.5mV	14.9mV	8.4mV	Pass
60% Load	15.0mV	8.5mV	15.3mV	9.0mV	Pass
70% Load	17.4mV	8.7mV	14.4mV	10.5mV	Pass
80% Load	18.8mV	10.1mV	15.9mV	11.4mV	Pass
90% Load	20.7mV	10.0mV	16.3mV	12.6mV	Pass
100% Load	25.7mV	11.8mV	17.5mV	19.2mV	Pass
110% Load	32.5mV	12.1mV	17.5mV	20.8mV	Pass
Cross-Load 1	11.9mV	9.1mV	15.9mV	6.8mV	Pass
Cross-Load 2	24.6mV	11.0mV	18.9mV	11.6mV	Pass

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We observe very good ripple suppression across the board, especially on the all-important +12V rail.

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.