OCZ ZS Series 650 W Review

Name: OCZ ZS Series 650 W
Brand: OCZ

crmaris

on Sep 12th, 2011,

in Power Supplies.

Manufacturer: OCZ

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of ZS 650W. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements OCZ ZS 650W
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	19.0 mV	10.4 mV	15.7 mV	11.4 mV	Pass
40% Load	26.8 mV	13.6 mV	9.7 mV	15.1 mV	Pass
50% Load	30.4 mV	15.3 mV	9.8 mV	16.0 mV	Pass
60% Load	35.8 mV	17.0 mV	10.6 mV	18.9 mV	Pass
80% Load	48.7 mV	21.6 mV	11.9 mV	19.4 mV	Pass
100% Load	57.3 mV	24.0 mV	14.2 mV	22.2 mV	Pass
Crossload 1	27.9 mV	22.0 mV	11.3 mV	12.2 mV	Pass
Crossload 2	50.2 mV	18.1 mV	14.0 mV	10.0 mV	Pass

Ripple/noise suppression on the minor rails and 5VSB is quite good and at +12V, the most important rail, it is decent since in the worst case (100% load) it is a little below the limit's (120mV) half. The lower capacity of the ZS 650W compared to its bigger brother helped in keeping ripple on the +12V rail at lower 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 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 0.01V) as standard.