Voltage Regulation Tests
Contents
The ATX12V specification states that positive voltages must be within 5% of their nominal values, and negative voltages must be within 10% of their nominal values. We consider a power supply as “flawless” if it shows voltages within 3% of their nominal values. In the table below, you can see the power supply voltages during our tests and, in the following table, the deviation, in percentage, of their nominal values.
The Sentey SDP850-SS presented excellent voltage regulation, with all outputs within 3% of their nominal values, except for the +5 V output during test one and the +3.3 V output during test five.
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12VA | +12.16 V | +12.12 V | +12.08 V | +12.04 V | +12.02 V |
| +12VB | +12.15 V | +12.08 V | +12.01 V | +11.96 V | +11.91 V |
| +5 V | +5.17 V | +5.14 V | +5.10 V | +5.07 V | +5.04 V |
| +3.3 V | +3.33 V | +3.29 V | +3.26 V | +3.24 V | +3.20 V |
| +5VSB | +5.08 V | +5.06 V | +5.02 V | +4.99 V | +4.96 V |
| -12 V | -12.08 V | -12.10 V | -12.11 V | -12.14 V | -12.16 V |
| Input | Test 1 | Test 2 | Test 3 | Test 4 | Test 5 |
| +12VA |
1.33% |
1.00% |
0.67% |
0.33% |
0.17% |
| +12VB |
1.25% |
0.67% |
0.08% |
-0.33% |
-0.75% |
| +5 V |
3.40% |
2.80% |
2.00% |
1.40% |
0.80% |
| +3.3 V |
0.91% |
-0.30% |
-1.21% |
-1.82% |
-3.03% |
| +5VSB |
1.60% |
1.20% |
0.40% |
-0.20% |
-0.80% |
| -12 V |
-0.67% |
-0.83% |
-0.92% |
-1.17% |
-1.33% |
Let’s discuss the ripple and noise levels on the next page.
