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Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the TPG-1200F1FAP's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

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Test	12V	5V	3.3V	5VSB	Pass/Fail
10% Load	10.3mV	4.3mV	3.6mV	3.9mV	Pass
20% Load	14.3mV	4.8mV	4.0mV	4.5mV	Pass
30% Load	16.4mV	5.2mV	4.6mV	5.2mV	Pass
40% Load	15.8mV	10.3mV	7.9mV	10.1mV	Pass
50% Load	19.4mV	8.0mV	9.2mV	7.6mV	Pass
60% Load	17.0mV	6.5mV	6.5mV	5.9mV	Pass
70% Load	16.8mV	9.5mV	7.4mV	8.6mV	Pass
80% Load	18.9mV	10.8mV	9.3mV	10.4mV	Pass
90% Load	18.5mV	9.4mV	9.0mV	9.0mV	Pass
100% Load	20.4mV	13.2mV	11.5mV	10.3mV	Pass
110% Load	23.0mV	25.1mV	22.2mV	23.2mV	Pass
Cross-Load 1	10.4mV	5.3mV	4.9mV	3.1mV	Pass
Cross-Load 2	22.5mV	13.1mV	11.5mV	10.2mV	Pass

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This platform's ripple suppression is really good, and that's without using in-cable capacitors.

With 110% load, we notice more ripple on the minor rails, which shows how hard we push the platform during our overload test.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.