FSP Hydro X Series 550 W Review

Name: FSP Hydro X Series 550 W
Brand: FSP

crmaris

on May 16th, 2016,

in Power Supplies.

Manufacturer: FSP

EMC Pre-Compliance Testing »

Ripple Measurements

You will see the ripple levels we measured on the rails of the HGX550 in the following table. The limits are, according to the ATX specification, 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements - FSP HGX550
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	46.1 mV	9.5 mV	8.5 mV	12.4 mV	Pass
20% Load	26.4 mV	10.8 mV	9.1 mV	16.2 mV	Pass
30% Load	28.1 mV	10.0 mV	9.4 mV	17.5 mV	Pass
40% Load	31.2 mV	11.2 mV	9.6 mV	18.0 mV	Pass
50% Load	28.2 mV	12.0 mV	10.2 mV	20.8 mV	Pass
60% Load	32.9 mV	13.3 mV	12.1 mV	22.7 mV	Pass
70% Load	37.3 mV	15.1 mV	12.9 mV	23.4 mV	Pass
80% Load	42.3 mV	17.1 mV	15.5 mV	26.4 mV	Pass
90% Load	44.7 mV	17.3 mV	15.0 mV	26.8 mV	Pass
100% Load	49.6 mV	19.7 mV	17.0 mV	29.5 mV	Pass
110% Load	50.9 mV	20.0 mV	17.5 mV	29.6 mV	Pass
Crossload 1	39.5 mV	16.5 mV	18.8 mV	13.0 mV	Pass
Crossload 2	42.6 mV	17.0 mV	11.8 mV	19.8 mV	Pass

Ripple suppression is pretty good at 5V and 3.3V and decent at +12V and 5VSB. We can't be that picky since this PSU doesn't belong to the high-end category. After all, 50 mV of ripple at +12V in such tough conditions doesn't leave much room for complaint.

Ripple at Full Load

You can see the AC ripple and noise the main rails registered (+12V, 5V, 3.3V, and 5VSB) in the following oscilloscope screenshots. 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 0.01 V) as the standard for all measurements.