To learn how we measure ripple, please click here.
The following table includes the ripple levels we measured on the rails of the AX1500i unit. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).
|10%||6.3 mV||4.5 mV||6.4 mV||2.3 mV||Pass|
|20%||10.6 mV||6.6 mV||6.6 mV||6.2 mV||Pass|
|30%||12.1 mV||5.1 mV||6.3 mV||3.3 mV||Pass|
|40%||13.1 mV||5.3 mV||6.9 mV||4.1 mV||Pass|
|50%||13.2 mV||5.8 mV||6.9 mV||4.6 mV||Pass|
|60%||13.3 mV||13.5 mV||8.4 mV||13.9 mV||Pass|
|70%||14.0 mV||12.2 mV||8.8 mV||11.8 mV||Pass|
|80%||14.9 mV||7.6 mV||8.6 mV||7.2 mV||Pass|
|90%||15.2 mV||7.6 mV||9.9 mV||7.5 mV||Pass|
|100%||15.4 mV||8.2 mV||11.2 mV||9.0 mV||Pass|
|103%||16.5 mV||9.0 mV||12.4 mV||9.3 mV||Pass|
|CL1||11.3 mV||12.9 mV||10.1 mV||4.7 mV||Pass|
|CL2||17.0 mV||6.4 mV||10.8 mV||9.6 mV||Pass|
Ripple suppression is simply amazing. The digital control demonstrates its capabilities once more. Although we should note that high-end analog platforms (like the Super Flower Leadex) are able to offer similar levels of performance. Basically, the only area where analog platforms cannot compete with digital platforms is load regulation, since digital circuits are still new when it comes to PSUs.
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 0.01V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.