![]() ![]() In the channel menu of your oscilloscope, you can turn on/off a couple of different settings. An oscilloscope’s offset range is dictated by the volt/div setting, so getting a usable view of the ripple is often impossible in DC coupling mode. ![]() To see this ripple, you need a sensitive volt/div setting and a huge offset. keep learning, sign up for free oscilloscope courses! What you really care about is the AC component around 12V. When should you use AC coupling? The Reason for AC Coupling on an OscilloscopeĪC coupling is intended for AC signals with a large DC offset.įor example, what if you want to look at ripple on a 12V power rail? You don’t really care about seeing the 12V DC component. ![]() I’ve heard this comment before, and it’s dead wrong: “ You should use AC coupling when looking at an AC signal.” Following this false AC coupling adage is an easy way to make some very wrong measurements. ![]()
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