Ripple Measurements
In the following table you will find the ripple levels that we measured on the main rails of TTBPK00G. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).
Ripple Measurements Thortech TTBPK00G |
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Test | 12 V | 5 V | 3.3 V | 5VSB | Pass/Fail |
20% Load | 28.9 mV | 15.3 mV | 21.8 mV | 11.9 mV | Pass |
40% Load | 36.7 mV | 16.3 mV | 22.8 mV | 15.0 mV | Pass |
50% Load | 41.5 mV | 16.9 mV | 24.5 mV | 16.6 mV | Pass |
60% Load | 43.0 mV | 17.4 mV | 25.1 mV | 16.5 mV | Pass |
80% Load | 50.0 mV | 20.2 mV | 28.9 mV | 20.9 mV | Pass |
100% Load | 60.8 mV | 21.2 mV | 30.1 mV | 25.2 mV | Pass |
Crossload 1 | 34.3 mV | 26.0 mV | 35.1 mV | 27.5 mV | Pass |
Crossload 2 | 68.2 mV | 18.5 mV | 27.1 mV | 18.6 mV | Pass |
Ripple at +12V is higher than what we expected from a high-end unit. In a perfect world we would like to see under 40mV ripple on this rail however 60mV of ripple, a value exactly the half of the limit, in any case cannot be called high; it's just that we have set the bar really high on expensive units like this one. On the minor rails ripple suppression is good although not ground breaking.
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 to 0.01V) as standard.
Ripple at Crossload 1
Ripple at Crossload 2