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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 Caslon II’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 | 7.8mV | 5.3mV | 8.6mV | 8.6mV | Pass |
| 20% Load | 9.0mV | 6.5mV | 10.9mV | 10.7mV | Pass |
| 30% Load | 11.3mV | 8.4mV | 13.3mV | 13.4mV | Pass |
| 40% Load | 15.4mV | 10.8mV | 15.8mV | 20.4mV | Pass |
| 50% Load | 21.5mV | 14.4mV | 17.5mV | 18.6mV | Pass |
| 60% Load | 25.5mV | 15.9mV | 19.4mV | 21.1mV | Pass |
| 70% Load | 28.4mV | 17.9mV | 21.7mV | 23.6mV | Pass |
| 80% Load | 30.2mV | 19.6mV | 24.0mV | 30.0mV | Pass |
| 90% Load | 36.5mV | 22.1mV | 25.5mV | 34.0mV | Pass |
| 100% Load | 44.7mV | 27.7mV | 27.3mV | 37.5mV | Pass |
| 110% Load | 67.3mV | 34.5mV | 29.1mV | 42.7mV | Pass |
| Cross-Load 1 | 14.8mV | 41.7mV | 14.4mV | 7.5mV | Pass |
| Cross-Load 2 | 30.3mV | 23.1mV | 23.7mV | 29.1mV | Pass |
Ripple suppression seems good for the budget category's standards. You just can't be picky with a $63 PSU.
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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