LEPA G850-MAS 850 W Review

Name: LEPA G850-MAS 850 W
Brand: LEPA

crmaris

on Sep 2nd, 2012,

in Power Supplies.

Manufacturer: LEPA

Performance Rating & Performance per Dollar »

Ripple Measurements

In the following table, you will see the ripple levels that we measured on the main rails of the G850-MAS. According to the ATX specification, the limits are 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements LEPA G850-MAS
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	24.3 mV	16.0 mV	18.7 mV	6.6 mV	Pass
40% Load	26.0 mV	20.2 mV	23.3 mV	10.1 mV	Pass
50% Load	27.4 mV	20.8 mV	24.1 mV	10.7 mV	Pass
60% Load	30.5 mV	21.7 mV	25.4 mV	11.2 mV	Pass
80% Load	37.3 mV	23.0 mV	26.6 mV	12.1 mV	Pass
100% Load	49.7 mV	27.4 mV	35.1 mV	15.8 mV	Pass
Crossload 1	19.6 mV	16.2 mV	21.2 mV	6.4 mV	Pass
Crossload 2	46.9 mV	23.3 mV	30.0 mV	15.1 mV	Pass

Ripple at +12V surely won't cause any troubles, but we are very picky on this subject and would like to see a reading closer or even below, at worst, 40 mV. Ripple suppression is pretty good at 5V, but not top notch with the 3.3V rail registering a little higher ripple reaching 35 mV. The best rail of all, ripple wise, was the 5VSB which didn't exceed 16 mV once.

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, and 5VSB). The bigger the fluctuations on the oscilloscope's screen, the bigger the ripple/noise. For all measurements, we set 0.01 V/Div (each vertical division/box equals to 0.01 V) as standard.