OCZ ZT Series 750 W Review

Name: OCZ ZT Series 750 W
Brand: OCZ

crmaris

on Oct 18th, 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 ZT 750W. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Ripple Measurements OCZ ZT 750W
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	10.0 mV	7.4 mV	6.6 mV	5.7 mV	Pass
40% Load	14.1 mV	7.6 mV	7.2 mV	9.7 mV	Pass
50% Load	15.4 mV	10.1 mV	8.3 mV	10.2 mV	Pass
60% Load	16.3 mV	11.5 mV	8.5 mV	12.7 mV	Pass
80% Load	22.0 mV	13.7 mV	9.3 mV	17.4 mV	Pass
100% Load	34.8 mV	16.9 mV	10.0 mV	22.3 mV	Pass
Crossload 1	11.7 mV	29.0 mV	15.0 mV	15.8 mV	Pass
Crossload 2	42.8 mV	21.3 mV	11.6 mV	19.8 mV	Pass

Ripple/noise suppression is very good for all load combinations. The ripple results of CL2 test show that the +12V rail is heavily stressed when it delivers almost the full power of the unit, which can lead to increased ripple at 5V and 3.3V, although load on the last two rails is minimal during this test. However still, in this worst case scenario ripple doesn't reach high 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.