Reviews - Delta DPS-1200QB-B Power Supply
Sample Provided by: Delta Electronics, Inc. (By Tazz on Thu, Nov-01-2012)

Page 3 - Load Testing the DPS-1200QB-B

Now we can get to the good stuff. With the aid of the SunMoon SM-5500 load tester and his friends, I will give the Delta DPS-1200QB-B a run for its money. I will start the testing by applying 50% of the +5VSB's rated capacity to the +5VSB rail. I will then move on to the progressive tests where I will load the unit up to 10%, 20%, 30%, 50%, 70%, 80%, 90%, and finally 100%. I will finish off the testing with a pair of Crossload tests where I max the minor rails in one, and the +12V rails in the other. After all that, I will flip the PSU over allowing it to draw in the heated air from the Hot-Box that is siphoned off of the load tester itself. 

Delta DPS-1200QB-B 1200W - Cold Load Tests
Test # +3.3V +5V +12V +5VSB DC Watts/
AC Watts
AC
Input
Eff. P.F. Intake/
Exhaust
  Standby Load Test
Test
0
0A 0A 0A 1.5A 7.59W/
9.45W
123.4V 80.3% .525 22°C/
22°C
0V 0V 0V 5.06V
Progressive Load Tests
Test
1
1.2A 1.2A 8.9A 0.3A
122.4W/
150.5W
123.4V
81.3%
.966
21°C/
28°C
3.34V 5.06V 12.19V 5.07V
Test
2
2.4A 2.4A 17.9A 0.6A 243.6W/
272.3W
122.8V 89.5% .989 22°C/
30°C
3.34V 5.05V 12.18V 5.06V
Test
3
3.7A 3.7A 27.0A 0.9A 365.3W/
402.3W
122.2V 90.8% .994 22°C/
32 °C
3.33V 5.04V 12.17V 5.05V
Test
4
6.1A 6.1A 45.0A 1.5A 606.9W/
666.9W
122.2V 91.0% .997 23°C/
37°C
3.32V 5.02V 12.16V 5.03V
Test
5
8.5A 8.5A 63.1A 2.1A 847.8W/
944.0W
121.4V 89.8% .997 23°C/
34°C
3.32V 5.00V 12.15V 5.00V
Test
6
9.8A 9.8A 72.1A 2.4A 969.1W/
1087.0W
121.5V 89.2% .997 22°C/
35°C
3.31V 4.99V 12.15V 4.99V
Test
7
11.0A 11.0A 81.2A 2.7A 1089.3W/
1231.0W
120.8V 88.5% .997 24°C/
36°C
3.31V 4.97V 12.14V 4.98V
Test
8
12.2A 12.2A 90.2A 3.0A 1209.4W/
1377.0W
121.1V 87.8% .997 24°C/
35°C
3.31V 4.96V 12.13V 4.97V
Crossload Tests
Test
CL1
13.7A 13.7A 0A 0A 115.3W/
148.3W
122.9V 77.7% .966 23°C/
31°C
3.32V 5.01V 12.18V 5.07V
Test
CL2
0A 0A 93.9A 0A 1146.2W/
1292.0W
120.3V 88.7% .997 23°C/
33°C
3.33V 5.02V 12.15V 5.03V

When it comes to the Standby test (Test 0), we are wanting to see better than 80% efficiency. As we can see in the chart above, we have 1.5A on the +5VSB rail showing a voltage of 5.06V. With a DC wattage of 7.59 and an AC wattage of 9.45 we end up with an efficiency of 80.3%, which is above average. 

Looking at the voltage side of the charts, we want to look at the voltage regulation achieved by each rail. We are looking at some pretty good results here. The +3.3V rail comes in at 0.91%, which is great. The +5V rail comes in at a little looser at 2%, which is still above average. The winner of the chicken dinner is the +12V rail coming in at 0.43%, which is in the excellent range mind you.

Now we are going to look at the efficiency side of the charts, keeping in mind that this is a Platinum rated unit that should produce 90%, 92%, and 89% efficiency results at the 20%(Test 2), 50%(Test 4), and 100%(Test 8) loads respectively. It doesn't take long to notice that we missed all three of them. To top it off, my 1% error tolerance that I allow for my test equipment isn't enough to save this unit with it missing Test 8 by 1.2%.

Looking at the last column, our exhaust temperatures look pretty good for a 1200W monster. As you can see by the results, we spot where the fan increases RMP to control the cooling of this unit. It's not very common to find the peak exhaust temperature at that low of a load. 

Delta DPS-1200QB-B 1200W - Hot Load Tests
Test # +3.3V +5V +12V +5VSB DC Watts/
AC Watts
AC
Input
Eff. P.F. Intake/
Exhaust
Progressive Load Tests
Test
1
1.2A 1.2A 8.9A 0.3A
122.4W/
151.0W
122.0V
81.1%
.968
25°C/
35°C
3.34V 5.06V 12.19V 5.07V
Test
2
2.4A 2.4A 17.9A 0.6A 243.5W/
272.5W
121.2V 89.4% .989 27°C/
35°C
3.34V 5.05V 12.18V 5.06V
Test
3
3.7A 3.7A 27.0A 0.9A 365.3W/
402.6W
121.7V 90.7% .994 30°C/
38 °C
3.33V 5.04V 12.17V 5.05V
Test
4
6.1A 6.1A 45.0A 1.5A 607.0W/
666.9W
121.1V 91.0% .997 35°C/
47°C
3.33V 5.02V 12.16V 5.03V
Test
5
8.5A 8.5A 63.1A 2.1A 847.8W/
945.4W
121.1V 89.7% .997 40°C/
54°C
3.32V 5.00V 12.15V 5.00V
Test
6
9.8A 9.8A 72.1A 2.4A 968.9W/
1089.0W
120.9V 89.0% .997 43°C/
57°C
3.32V 4.99V 12.15V 4.99V
Test
7
11.0A 11.0A 81.2A 2.7A 1089.1W/
1233.0W
120.4V 88.3% .997 38°C/
56°C
3.31V 4.97V 12.14V 4.98V
Test
8
12.2A 12.2A 90.2A 3.0A 1209.0W/
1383.0W
120.0V 87.4% .997 38°C/
60°C
3.31V 4.96V 12.13V 4.97V
Crossload Tests
Test
CL1
13.7A 13.7A 0A 0A 115.3W/
148.8W
123.0V 77.5% .967 25°C/
38°C
3.32V 5.01V 12.17V 5.07V
Test
CL2
0A 0A 93.9A 0A 1145.4W/
1296.0W
120.5V 88.4% .997 39°C/
54°C
3.33V 5.02V 12.15V 5.03V

Well this is going to be easy. Although, I did have a little fluctuation on the +12V rails figures, in the end we have the same results as we did in the Cold Test. The +3.3V hit 0.91%, the +5V hit 2% on the money, and the +12V managed to hold on to its 0.43%. 

Looking at the efficiency this time around, our numbers drop off just a tad in Test 2, and Test 8. In the end, we are still missing the 80PLUS boat to Platinumville. Keep in mind that we are only missing it by 0.6% at full load when I factor in my error tolerance.

Of course, when we move to the temperatures this time around, we are going to see higher numbers due to the use of the Hot-Box. We are still able to pin point where the fan steps it up a notch or two. 

Delta DPS-1200QB-B 1200W - Overshoot Transient Tests
VSB On VSB to Full, 12V Off to Full, 12V

Looking at the Overshoot Transient scope shots, we have a nice gradual incline with a slight bump in the curve on the VSB On test. Looking at the next two tests, we can see a small spike just under the 10V mark in both shots that doesn't hurt anything. PASS, PASS, and PASS is about all we can say here.

Delta DPS-1200QB-B 1200W - Oscilloscope
Test # +3.3V +5V +12V +5VSB
Test
1
Test
2
Test
3
Test
4
Test
5
Test
6
Test
7
Test
8
Test
CL1
Test
CL2

Look at that, those are some nice looking scope shots wouldn't you say? Here the +3.3, +5V, and +5VSB all stay under 17mV, while the +12V and -12V stay under 30mV. That's a Grrrrreat job right there.



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