---
title: "How to Measure Ripple Voltage on a Switch-Mode Power Supply | Workbench Wednesdays #51"
description: "Measuring a switch-mode power supply (SMPS) with a DMM might show a stable voltage. But the same DC rail on an oscilloscope can show a completely different story! In this…"
canonical: "https://www.baldengineer.com/how-to-measure-ripple-voltage-on-a-switch-mode-power-supply-workbench-wednesdays-51.html"
author: "James Lewis"
date: "2022-03-01T00:23:00Z"
lastmod: "2022-04-01T23:25:22Z"
categories: ["blog","element14","workbench-wednesdays","videos"]
tags: ["electronic-load","kicad","measurements","oscilloscope","pcb","smps"]
---

# How to Measure Ripple Voltage on a Switch-Mode Power Supply | Workbench Wednesdays #51


Measuring a switch-mode power supply (SMPS) with a DMM might show a stable voltage. But the same DC rail on an oscilloscope can show a completely different story! In this video, learn how to correctly set up an oscilloscope to characterize the noise an SMPS creates in a circuit.