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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 SSR-750PX’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 | 6.8mV | 4.2mV | 3.4mV | 4.7mV | Pass |
| 20% Load | 10.0mV | 5.0mV | 4.1mV | 5.2mV | Pass |
| 30% Load | 12.8mV | 5.5mV | 4.5mV | 5.7mV | Pass |
| 40% Load | 15.4mV | 6.1mV | 5.5mV | 6.4mV | Pass |
| 50% Load | 16.2mV | 7.7mV | 6.2mV | 6.7mV | Pass |
| 60% Load | 15.3mV | 8.5mV | 7.1mV | 8.7mV | Pass |
| 70% Load | 13.2mV | 9.0mV | 7.5mV | 8.9mV | Pass |
| 80% Load | 13.5mV | 8.8mV | 8.5mV | 9.9mV | Pass |
| 90% Load | 15.3mV | 10.1mV | 9.2mV | 11.0mV | Pass |
| 100% Load | 16.3mV | 11.4mV | 9.6mV | 11.5mV | Pass |
| 110% Load | 17.7mV | 10.8mV | 9.8mV | 11.4mV | Pass |
| Cross-Load 1 | 8.6mV | 9.4mV | 8.2mV | 4.8mV | Pass |
| Cross-Load 2 | 17.2mV | 7.3mV | 5.5mV | 9.7mV | Pass |
Ripple suppression is great on all of the rails thanks to a good design 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.
Ripple At Full Load
Ripple At 110-Percent Load
Ripple At Cross-Load 1
Ripple At Cross-Load 2
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