Ripple Measurements
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This table includes the ripple levels we measured on the SPR-0850F-R'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 | 9.1mV | 7.6mV | 11.9mV | 5.8mV | Pass |
| 20% Load | 10.5mV | 8.0mV | 14.7mV | 7.1mV | Pass |
| 30% Load | 10.7mV | 8.4mV | 15.2mV | 8.3mV | Pass |
| 40% Load | 12.0mV | 8.4mV | 15.9mV | 9.1mV | Pass |
| 50% Load | 14.1mV | 8.5mV | 14.9mV | 8.4mV | Pass |
| 60% Load | 15.0mV | 8.5mV | 15.3mV | 9.0mV | Pass |
| 70% Load | 17.4mV | 8.7mV | 14.4mV | 10.5mV | Pass |
| 80% Load | 18.8mV | 10.1mV | 15.9mV | 11.4mV | Pass |
| 90% Load | 20.7mV | 10.0mV | 16.3mV | 12.6mV | Pass |
| 100% Load | 25.7mV | 11.8mV | 17.5mV | 19.2mV | Pass |
| 110% Load | 32.5mV | 12.1mV | 17.5mV | 20.8mV | Pass |
| Cross-Load 1 | 11.9mV | 9.1mV | 15.9mV | 6.8mV | Pass |
| Cross-Load 2 | 24.6mV | 11.0mV | 18.9mV | 11.6mV | Pass |
We observe very good ripple suppression across the board, especially on the all-important +12V rail.
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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