![[H]ardOCP](/images/blank.gif){kind=small}
- Date:
- Tuesday , August 19, 2008
- Author:
- Paul Johnson
- Editor:
- Kyle Bennett
- Google +1
Kingwin ABT-1220MA1S Mach 1 Power Supply
Kingwin has come to us with its power supplies before, and while that 800w unit did OK, it was not exactly anything we would consider an award winner. Today we have another Kingwin weighing in at a huge ~1200 watts. Can you say "Torture Test at 45C and 960 watts?” Fire extinguisher. Check! Let's get it on.
Ripple Testing
Since voltage output is not the only concern when it comes to quality DC output we next examined the ripple and regulation characteristics of the Kingwin ABT-1220MA1S. We examine these points since unnecessary ripple can cause premature failure of sensitive components in a number of different PC subsystems.
The DC output quality was logged via our digital oscilloscope and the EasyScope II software package. Each divider horizontally represents 2ms while each divider vertically represents 0.05v or 50mv. The ATX specification states that a unit should remain at or below 120mV of ripple and noise on the 12v rail while under 50mV on the 3.3v/5v rails.
Control Test Graphing
This image is the blank background control test on an unused connector from our SM-8800 during the Kingwin ABT-1220MA1S testing. This lets us determine what the background noise looks like during testing. If at any time a trace deviates from this reading that is the noise/ripple being logged by the oscilloscope for that rail. As you can see the trace is flat and shows as a blue line obscuring the axis. If during a test the axis becomes visible but a waveform is hard to discern it is most likely due to the amplitude of the trace being small in relation to our voltage divider.
120v and 100v Input
Test #1 is equal to approximately 25% of the rated capacity of the Kingwin ABT-1220MA1S at 45c. This makes Test #1 equal to 302w by loading the 12v rails to a combined 20a, the 5v rail to 6a, the 3.3v rail to 4a, the +5vsb to 2a, and the -12v to 0.5a. The results of Test #1 are starting off very good with the 12v rails peaking at 15mV. The 5v rail is peaking at juts 10mV while the 3.3v rail is peaking at 15mV. These results are all excellent but the load is only 25% at this point.
Test #2 is equal to approximately 50% of the rated capacity of the Kingwin ABT-1220MA1S at 45c. This makes Test #2 equal to 598w by loading the 12v rails to a combined 40a, the 5v rail to 10a, the 3.3v rail to 7a, the +5vsb to 2a, and the -12v to 0.5a. Test #2 sees slight increases at both 120v and 100v as the 12v rails are now peaking at ~25mV. The 5v rail is peaking at ~15mV while the 3.3v rail has moved up to ~20mV. These are small increases and very good given the doubling of the load from Test #1.
Test #3 is equal to approximately 75% of the rated capacity of the Kingwin ABT-1220MA1S at 45c. This makes Test #3 equal to 906w by loading the 12v rail to 66a, the 5v rail to 13a, the 3.3v rail to 9a, the +5vsb to 2a, and the -12v to 0.5a. Test #3 at 120v and 100v sees some interesting changes. The 12v rails ripple/noise values have increased as the peak trace amplitude is now hitting ~40mV. The flipside to this is that the 5v and 3.3v rails have seen their trace amplitudes shrink to ~10mV.
Test #4 is equal to approximately 100% of the rated capacity of the Kingwin ABT-1220MA1S at 45c. This makes Test #4 equal to 1198w by loading the 12v rail to 90a, the 5v rail to 15a, the 3.3v rail to 7a, the +5vsb to 2a, and the -12v to 0.5a. In Test #4 we see the 12v rails trace amplitude increase once more with the peak value on the 12v rails hitting ~70mV while the majority of the rails are staying closer to 60mV. The minor rails have maintained their very quiet ways as they are peaking at less than ~10mV.
Torture Test
The Torture Test is equal to approximately 80% of the rated capacity of the Kingwin ABT-1220MA1S at 45c. This makes the Torture Test equal to 960w by loading the 12v rail to 69a, the 5v rail to 14a, the 3.3v rail to 11a, the +5vsb to 2a, and the -12v to 0.5a. The results of the Torture test are very similar to Test #3 as the 12v rails are peaking at ~45mV while the minor rails, 5v and 3.3v, are peaking at less than 10mV.
DC Output Quality Summary
The DC Output Quality of the Kingwin ABT-1220MA1S was very good throughout testing with some interesting trends. During the first 50% of the unit’s DC output capacity the 5v and 3.3v rails ripple/noise values increased with load to a bit below 1/2 of the ATX12v specification limit. However, once we moved into the upper half of the unit’s DC output capacity these values actually retreated to below 10mV. At the same time the 12v rails ripple/noise values continued to increase throughout testing but peaked at ~60-70mV or just 1/2 of the ATX12v specification limit. These results while a bit unique in our experience are very good for this or any other 1200w power supply and as such make for a resounding pass in the portion of our testing.