FSP Hydro G Series 750 W Review

Name: FSP Hydro G Series 750 W
Brand: FSP

crmaris

on Dec 21st, 2015,

in Power Supplies.

Manufacturer: FSP

EMC Pre-Compliance Testing »

Ripple Measurements

You will see the ripple levels we measured on the rails 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 HG750
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	27.3 mV	6.3 mV	7.3 mV	9.7 mV	Pass
20% Load	21.0 mV	5.9 mV	9.6 mV	10.7 mV	Pass
30% Load	20.1 mV	7.2 mV	10.4 mV	12.6 mV	Pass
40% Load	17.0 mV	7.6 mV	11.8 mV	14.5 mV	Pass
50% Load	18.4 mV	8.5 mV	12.4 mV	16.0 mV	Pass
60% Load	18.7 mV	8.8 mV	13.6 mV	18.2 mV	Pass
70% Load	19.1 mV	10.2 mV	15.2 mV	19.4 mV	Pass
80% Load	19.3 mV	11.4 mV	16.6 mV	21.6 mV	Pass
90% Load	19.9 mV	12.4 mV	17.7 mV	21.7 mV	Pass
100% Load	21.6 mV	13.0 mV	19.9 mV	21.9 mV	Pass
110% Load	22.4 mV	13.0 mV	21.3 mV	22.9 mV	Pass
Crossload 1	18.7 mV	11.2 mV	11.5 mV	8.7 mV	Pass
Crossload 2	21.2 mV	13.1 mV	20.2 mV	15.6 mV	Pass

Ripple suppression was excellent at +12V and 5V and good enough at 3.3V and 5VSB. With 10% load, ripple on the +12V rail is increased because the main switchers operate in PWM mode at light loads, only to switch into FM mode with higher loads.

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. We set 0.01 V/Div (each vertical division/box equals 0.01 V) as the standard for all measurements.