Ripple Measurements
You will see the ripple levels that we measured on the main rails of the HCG-750M in the following table. The limits are, according to the ATX specification, 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).
Ripple Measurements Antec HCG-750M |
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Test | 12 V | 5 V | 3.3 V | 5VSB | Pass/Fail |
20% Load | 9.1 mV | 7.3 mV | 7.8 mV | 9.7 mV | Pass |
40% Load | 12.4 mV | 7.8 mV | 8.3 mV | 11.5 mV | Pass |
50% Load | 14.5 mV | 7.3 mV | 8.5 mV | 12.3 mV | Pass |
60% Load | 16.1 mV | 7.6 mV | 8.7 mV | 11.4 mV | Pass |
80% Load | 21.0 mV | 8.1 mV | 9.1 mV | 11.8 mV | Pass |
100% Load | 25.5 mV | 8.1 mV | 9.4 mV | 12.2 mV | Pass |
110% Load | 28.7 mV | 8.3 mV | 10.0 mV | 13.2 mV | Pass |
Crossload 1 | 10.5 mV | 6.9 mV | 7.9 mV | 9.8 mV | Pass |
Crossload 2 | 26.5 mV | 7.5 mV | 8.8 mV | 12.5 mV | Pass |
Ripple suppression was excellent on all rails. This wasn't a surprise to us because Seasonic's implementations, even the lower-end ones, are always ripple proof, which allows them to deliver ultra-clean DC outputs.
Ripple at Full Load
In the following oscilloscope screenshots, you can see the AC ripple and noise that the main rails registered (+12V, 5V, 3.3V, and 5VSB). The bigger the fluctuations on the oscilloscope's screen, the bigger the ripple / noise. For all measurements, we set 0.01 V/Div (each vertical division / box equals 0.01 V) as standard.
Ripple at 110% Load
Ripple at Crossload 1
Ripple at Crossload 2