FSP Aurum CM Gold 750 W Review

Name: FSP Aurum CM Gold 750 W
Brand: FSP

crmaris

on Aug 8th, 2011,

in Power Supplies.

Manufacturer: FSP

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of AU-750M. 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	26.2 mV	7.8 mV	19.2 mV	Pass
40% Load	20.8 mV	10.6 mV	15.4 mV	Pass
50% Load	23.6 mV	10.8 mV	18.2 mV	Pass
60% Load	26.8 mV	11.2 mV	20.8 mV	Pass
80% Load	32.2 mV	13.4 mV	24.4 mV	Pass
100% Load	39.6 mV	14.6 mV	29.8 mV	Pass
Crossload 1	46.8 mV	28.6 mV	30.8 mV	Pass
Crossload 2	34.6 mV	26.6 mV	32.4 mV	Pass

Ripple at +12V is low, although not among the lowest we have ever measured. At 5V, ripple suppression is very good, except the CL tests where we clearly see that the minor rails are heavily stressed. Finally, ripple at 3.3V is in the normal range, although in most cases it is twice as much compared to the 5V ripple readings.

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. For the first screenshot we used 0.02 V/Div, so actually the registered ripple is much bigger than it seems (compared to the other screenshots where 0.01 V/Div was used).