Everything you need to know to become an oscilloscope PRO
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Agenda:
0:00 What is an oscilloscope
1:30 How to get started using an oscilloscope
1:48 Oscilloscope Probes
2:16 Oscilloscope Signal Scaling
2:27 Oscilloscope Auto Scale button
4:26 Oscilloscope Probe Calibration
5:09 Oscilloscope Measurements
8:06 Oscilloscope Triggering
12:03 How to Capture Signals With an Oscilloscope
15:05 Oscilloscope Acquisition Modes
16:24 Waveform Analysis with an Oscilloscope
18:02 Additional Learning
18:44 Keysight University Live Winners
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The digital storage oscilloscope we used:
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Today we’ll explore how to use an oscilloscope. By the end of this you and your trusty oscilloscope will be equipped to tackle whatever crazy test challenges come your way.
An oscilloscope visually shows you what’s happening electrically at the tip of your probe with respect to ground. It’s kinda like a camera, but for electricity. Once you can see your signal, you can make measurements, debug your device’s behavior, and characterize your device’s performance.
Oscilloscopes come in all shapes and sizes. When you start using an oscilloscope the first thing you should do is press “default setup" which will get rid of any weird settings leftover from the last user who didn’t watch this video and just started pressing buttons hoping it would work.
Then, connect your oscilloscope to your device with a probe. Most oscilloscopes, or “scopes,” come with a set of passive probes. These aren’t just a wire, there’s actual circuitry inside that helps make the signals pretty. This clip goes to earth ground [the ground clip] to give your scope a measurement reference. It’s important to remember that this is a ground connection and should only be connected to ground. Nothing else.
Once everything is connected, you’ll hopefully see something on the screen. Odds are, it’s not going to be quite what you want to see, so you can change it. The easiest way to change it is with the auto-scale button.
Oscilloscopes have four main controls that change what you see. The first two control horizontal scaling, and horizontal position. The horizontal axis represents time, and we can change the scale and the and offset using the corresponding knobs [horizontal scale and delay]. Notice that the screen has “divisions” on it to give us an idea of our signal’s parameters.
The other two main controls handle vertical scaling and vertical offset per channel. [horizontal knobs] Most oscilloscopes have more than one input, or channel, and you can independently set each channel’s voltage (or current) per division [vertical channel knobs]. You can play with the vertical and horizontal settings until you’re happy with what you can see. Oscilloscopes have more than one channel so you can see multiple signals at once.
The first time you connect a probe to a scope channel, you need to impedance match the probe and the scope. It’s easier than it sounds. Connect to the probe cal ports [probe comp ports], and get the signal on screen. Good thing we know how to do that now. We want to see a nice, square shape here, this is a little off. So, I’ll use the provided adjuster and tweak this until the edge looks sharp, meaning our scope and probe are impedance matched and this transmission line is happy. Fancy probes don’t do this. Instead, they get full S-parameter characterization from the factory. The scope reads the s-parameter information from the probe and compensates automagically. It’s super cool.
Now that my probe is compensated, and we can connect to our device.
To make measurements, hit the measurement button.
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