Zalman ZM1000-HP Plus 1000 W Review

Name: Zalman ZM1000-HP Plus 1000 W
Brand: Zalman

crmaris

on Apr 29th, 2011,

in Power Supplies.

Manufacturer: Zalman

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of ZM1000-HP Plus. 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	18.2 mV	9.6mV	4.0 mV	Pass
40% Load	22.8 mV	13.4 mV	5.8 mV	Pass
50% Load	25.6 mV	15.4 mV	6.2 mV	Pass
60% Load	26.8 mV	14.6 mV	6.2 mV	Pass
80% Load	33.8 mV	18.8 mV	5.8 mV	Pass
100% Load	42.8 mV	17.8 mV	6.2 mV	Pass
Crossload 1	20.4 mV	26.8 mV	7.8 mV	Pass
Crossload 2	45.8 mV	19.6 mV	6.8 mV	Pass

Ripple/noise suppresion at 3.3V is excellent. At +12V and 5V is fairly good but surely is not among the best we have seen.

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 wont be the case.

Ripple at Crossload 2

For the first screenshot we used 0.02 V/Div, so actually the registered ripple is much bigger than it seems (compared to the other screenshots where 0.01 V/Div was used). As above the order of images is +12V, 5V and 3.3V.