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Ripple and Noise Tests

Voltages at the power supply outputs must be as “clean” as possible, with no noise or oscillation (also known as “ripple”). The maximum ripple and noise levels allowed are 120 mV for +12 V and -12 V outputs, and 50 mV for +5 V, +3.3 V and +5VSB outputs. All values are peak-to-peak figures. We consider a power supply as being top-notch if it can produce half or less of the maximum allowed ripple and noise levels.

The Enermax NAXN 82+ 550 W provided very low ripple and noise levels during all tests, as you can see in the table below.

Input Test 1 Test 2 Test 3 Test 4 Test 5
+12VA 10.2 mV 10.4 mV 14.0 mV 30.4 mV 51.2 mV
+12VB 10.0 mV 10.4 mV 13.4 mV 32.2 mV 32.2 mV
+5 V 8.2 mV 8.6 mV 10.8 mV 12.6 mV 15.4 mV
+3.3 V 22.2 mV 8.8 mV 10.2 mV 12.8 mV 15.4 mV
+5VSB 13.8 mV 15.4 mV 18.8 mV 21.4 mV 24.8 mV
-12 V 12.4 mV 14.0 mV 16.8 mV 20.8 mV 28.4 mV

Below you can see the waveforms of the outputs during test five.

Enermax NAXN 82+ 550 W power supplyFigure 18: +12VA input from load tester during test five at 548.6 W (51.2 mV)

Enermax NAXN 82+ 550 W power supplyFigure 19: +12VB input from load tester during test five at 548.6 W (32.2 mV)

Enermax NAXN 82+ 550 W power supplyFigure 20: +5V rail during test five at 548.6 W (15.4 mV)

Enermax NAXN 82+ 550 W power supplyFigure 21: +3.3 V rail during test five at 548.6 W (15.4 mV)

Let’s see if we can pull more than 550 W from this unit.

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Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.