Jou Jye BITWIN BW-B520JL 520W Review

Name: Jou Jye BITWIN BW-B520JL 520W
Brand: Jou Jye

crmaris

on Mar 23rd, 2011,

in Power Supplies.

Manufacturer: Jou Jye

Value & Conclusion »

Ripple Measurements

Below you will find the ripple levels that we measured on the main rails of BW-B520JL. 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	8.4 mV	4.4 mV	5.2 mV	Pass
40% Load	9.8 mV	4.8 mV	6.4 mV	Pass
50% Load	11.6 mV	5.4 mV	6.6 mV	Pass
60% Load	13.2 mV	5.6 mV	7.6 mV	Pass
80% Load	14.2 mV	5.6 mV	7.8 mV	Pass
100% Load	22.8 mV	6.2 mV	13.8 mV	Pass
Crossload 1	17.2 mV	23.8 mV	10.8 mV	Pass
Crossload 2	27.6 mV	7.0 mV	15.8 mV	Pass

Ripple/noise is very low on all rails. As usual Seasonic did a terrific job in ripple suppression. Only on hi-end and way more expensive PSUs we have seen such low ripple levels.

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 won't be the case.