Ripple Measurements
To learn how we measure ripple, please click here.
The following table includes the ripple levels we measured on the SSR-1000PD Ultra'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 | 6.3mV | 3.3mV | 5.3mV | 3.2mV | Pass |
| 20% Load | 9.2mV | 4.8mV | 6.6mV | 4.6mV | Pass |
| 30% Load | 10.7mV | 4.7mV | 6.5mV | 4.6mV | Pass |
| 40% Load | 9.5mV | 7.7mV | 9.9mV | 6.9mV | Pass |
| 50% Load | 8.1mV | 4.5mV | 6.8mV | 5.0mV | Pass |
| 60% Load | 9.1mV | 4.6mV | 6.5mV | 5.9mV | Pass |
| 70% Load | 10.6mV | 5.8mV | 7.0mV | 6.7mV | Pass |
| 80% Load | 12.4mV | 5.7mV | 7.4mV | 7.3mV | Pass |
| 90% Load | 13.4mV | 5.6mV | 8.1mV | 7.9mV | Pass |
| 100% Load | 14.0mV | 6.3mV | 8.4mV | 8.5mV | Pass |
| 110% Load | 15.1mV | 6.7mV | 9.6mV | 9.3mV | Pass |
| Cross-Load 1 | 7.8mV | 4.5mV | 6.6mV | 3.8mV | Pass |
| Cross-Load 2 | 14.6mV | 5.9mV | 8.2mV | 8.0mV | Pass |
Seasonic's ripple suppression is superb, even without the use of in-cable caps. The company outdoes itself with this fresh Prime Ultra platform.
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-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
MORE: Best Power Supplies
MORE: How We Test Power Supplies
MORE: All Power Supply Content