Ripple Measurements
In the following table you will find the ripple levels that we measured on the main rails of CX430 V2. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V & 3.3V).
Ripple Measurements |
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Test | 12 V | 5 V | 3.3 V | Pass/Fail |
20% Load | 8.6 mV | 4.2 mV | 3.0 mV | Pass |
40% Load | 8.8 mV | 4.2 mV | 3.0 mV | Pass |
50% Load | 9.2 mV | 4.4 mV | 3.6 mV | Pass |
60% Load | 10.2 mV | 5.2 mV | 3.8 mV | Pass |
80% Load | 12.4 mV | 6.0 mV | 4.2 mV | Pass |
100% Load | 22.8 mV | 6.8 mV | 4.6 mV | Pass |
Crossload 1 | 10.8 mV | 14.2 mV | 7.2 mV | Pass |
Crossload 2 | 17.2 mV | 7.2 mV | 5.0 mV | Pass |
Ripple/noise suppression is great, especially on the 3.3V rail! We had to double check all connections and measure with both oscilloscopes to ensure that these excellent results were correct! Practically 3.3V is really flat.
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). The bigger the fluctuations on the oscilloscope's screen the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals to 0.01V) as standard but sometimes we are forced to use 0.02 V/Div, meaning that the fluctuations will look smaller but actually this wont be the case.
Ripple at Crossload 1
The order of images is +12V, 5V and 3.3V.
Ripple at Crossload 2
As above the order of images is +12V, 5V and 3.3V.