RASURBO Real & Power 550 W Review

Name: RASURBO Real & Power 550 W
Brand: RASURBO

crmaris

on Jun 6th, 2011,

in Power Supplies.

Manufacturer: RASURBO

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of RAPM550. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V & 3.3V).

Ripple Measurements
Test	12 V	5 V	3.3 V	Pass/Fail
20% Load	31.2 mV	5.6 mV	8.4 mV	Pass
40% Load	45.6 mV	8.2 mV	10.4 mV	Pass
50% Load	54.2 mV	9.6 mV	11.4 mV	Pass
60% Load	60.2 mV	12.2 mV	14.8 mV	Pass
80% Load	68.2 mV	21.6 mV	25.6 mV	Pass
100% Load	85.6 mV	23.2 mV	27.8 mV	Pass
Crossload 1	41.4 mV	15.2 mV	15.8 mV	Pass
Crossload 2	72.2 mV	20.8 mV	36.6 mV	Pass

Ripple on the +12V rail is well within ATX spec limits but in a contemporary PSU we don't like to see close to 90mV readings. The minor rails here performed much better and only at CL2 test 3.3V registered over 30mV ripple. Similar to the voltage regulation tests if you notice the big difference in ripple readings of +12V between 80% load and 100% you will see that the PSU is over-stressed to deliver those 100 extra Watts.

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. For RAPM550 we have set 0.02 V/Div (each vertical division/box equals to 0.02V) as standard for all below screenshots.