How to measure power supply ripple?

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How to measure power supply ripple? [Copy link]

Hello everyone in the forum, I would like to ask if the ripple of the power supply can be measured? How to measure the ripple of the power supply in general?

maychang

The oscilloscope probe is connected in series with an appropriate capacitor to display the voltage waveform across the load. The peak value or peak-to-peak value of the ripple can be seen from the waveform. The AC voltmeter (with a wide enough frequency band) is connected in series with an appropriate capacitor to measure the voltage across the load to obtain the average value or effective value of the ripple.

wangerxian

When using an oscilloscope to measure the positive and negative of a power supply, it is important to ensure that the probe grounding loop is as short as possible.

hahajing

The name of the OP is very meaningful. Can you tell me your story?

maychang

When measuring series capacitance with an oscilloscope or voltmeter as described on the 2nd and 3rd floors, it is important to use the highest setting first, then switch to a lower setting after it stabilizes.

dabiaoke

The oscilloscope bandwidth is set to 20M, the probe is multiplied by 1, 10U electrolytic plus 103 capacitor, and it is best to remove the ground clip, so that the v test can filter out noise!

qwqwqw2088

Connect the oscilloscope to the power supply output, select AC coupling, a good probe, and a short and thick line.