Ripple Measurements
To learn how we measure ripple, please click here.
The following table includes the ripple levels we measured on the RM850x'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 | 3.3mV | 3.8mV | 4.4mV | 3.3mV | Pass |
| 20% Load | 3.9mV | 5.3mV | 5.6mV | 5.0mV | Pass |
| 30% Load | 5.0mV | 5.2mV | 5.5mV | 4.9mV | Pass |
| 40% Load | 5.7mV | 5.3mV | 6.2mV | 6.1mV | Pass |
| 50% Load | 6.5mV | 5.7mV | 7.0mV | 7.2mV | Pass |
| 60% Load | 7.0mV | 7.4mV | 8.1mV | 9.0mV | Pass |
| 70% Load | 7.9mV | 7.9mV | 9.8mV | 9.9mV | Pass |
| 80% Load | 8.7mV | 8.6mV | 10.9mV | 12.3mV | Pass |
| 90% Load | 10.3mV | 8.9mV | 10.9mV | 12.8mV | Pass |
| 100% Load | 11.9mV | 12.2mV | 11.9mV | 16.8mV | Pass |
| 110% Load | 14.8mV | 10.5mV | 12.5mV | 15.6mV | Pass |
| Cross-Load 1 | 5.5mV | 11.6mV | 11.2mV | 8.0mV | Pass |
| Cross-Load 2 | 11.8mV | 7.5mV | 9.1mV | 14.2mV | Pass |
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Ripple suppression is excellent thanks to a good platform and extra in-cable caps.
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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