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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-1000TR’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 | 11.9mV | 4.2mV | 13.0mV | 7.6mV | Pass |
| 20% Load | 14.2mV | 4.0mV | 8.8mV | 5.0mV | Pass |
| 30% Load | 11.9mV | 4.8mV | 10.5mV | 6.0mV | Pass |
| 40% Load | 10.6mV | 5.2mV | 12.0mV | 6.2mV | Pass |
| 50% Load | 11.8mV | 5.7mV | 13.5mV | 7.0mV | Pass |
| 60% Load | 13.1mV | 5.6mV | 13.0mV | 7.6mV | Pass |
| 70% Load | 15.3mV | 6.3mV | 15.3mV | 9.8mV | Pass |
| 80% Load | 17.4mV | 6.6mV | 15.2mV | 10.7mV | Pass |
| 90% Load | 17.4mV | 6.7mV | 16.0mV | 9.8mV | Pass |
| 100% Load | 18.1mV | 7.2mV | 16.6mV | 11.4mV | Pass |
| 110% Load | 21.7mV | 7.4mV | 16.9mV | 12.0mV | Pass |
| Cross-Load 1 | 13.8mV | 4.9mV | 10.7mV | 5.7mV | Pass |
| Cross-Load 2 | 16.5mV | 7.0mV | 15.0mV | 10.7mV | Pass |
Ripple suppression is excellent on all rails. Impressively, this result is achieved without the use of in-cable capacitors.
Again, the SSR-1000PD performs better. But with such low ripple, both PSUs are winners in our book.
Ripple Oscilloscope Screenshots
The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). We usually set 0.01 V/Div (each vertical division/box equals 0.01V), but in some cases we use a smaller setting as well, if the registered ripple is very low.
Ripple At Full Load
Ripple At 110-Percent Load
Ripple At Cross-Load 1
Ripple At Cross-Load 2
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