To learn how we measure ripple, please click here.
The following table includes the ripple levels we measured on the TPG-0850D-R's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).
Ripple suppression up to 90% load is excellent at +12V. However, under full load it increases significantly, exceeding 50mV. While that's not disturbingly high, it'd be ideal to see the result under 40mV.
On the other hand, the minor rails' ripple remains low, even during the overload test.
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 0.01 V) as the standard for all measurements.