OCZ ZS Series 750 W Review

Name: OCZ ZS Series 750 W
Brand: OCZ

crmaris

on Sep 19th, 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 750W. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements OCZ ZS 750W
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	24.9 mV	10.1 mV	22.3 mV	28.1 mV	Pass
40% Load	31.5 mV	11.0 mV	15.2 mV	19.5 mV	Pass
50% Load	40.7 mV	12.9 mV	17.0 mV	36.7 mV	Pass
60% Load	48.5 mV	15.5 mV	21.5 mV	42.9 mV	Pass
80% Load	59.8 mV	17.2 mV	22.0 mV	27.8 mV	Pass
100% Load	75.2 mV	18.7 mV	17.2 mV	25.0 mV	Pass
Crossload 1	34.0 mV	21.2 mV	15.8 mV	21.2 mV	Pass
Crossload 2	62.3 mV	12.5 mV	17.3 mV	29.1 mV	Pass

Ripple suppression on the minor rails (5V & 3.3) is quite good but at +12V and 5VSB is nothing to write home about, although it's well below the equivalent thresholds. Especially at 5VSB our data logging program caught some high ripple spikes (see 60% load results) which however won't pose any problems.

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.