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Introduction to Oscilloscopes: What They Are and How to Use Them
- 1. An introduction to oscilloscopes http://www.useoscilloscope.com
- 2. What is an oscilloscope ? ¤ Oscilloscope are devices made to observe time-varying voltage signals ¤ They can be considered as the most important measurement devices in any lab ¤ They are used in many domains : engineering, but also medicine, and science in general
- 3. Basics of measurement ¤ There are different analog quantities we can measure with an oscilloscope : ¤ Information about the voltage trace : mean value, amplitude, maximum value … ¤ Information about time : frequency of the signal, some oscilloscopes can also directly compute a Fourier transform of the signal ¤ Some digital oscilloscopes can also analyze digital signals, like decode USB frames
- 4. Different kind of oscilloscopes ¤ Analog oscilloscopes ¤ The oldest type of oscilloscopes ¤ Consist of a cathode ray tube and amplifiers ¤ They operate by projecting the voltage trace to a screen via an entirely analog process
- 5. Different kind of oscilloscopes ¤ Digital oscilloscopes ¤ Employ Analog-to-Digital Converters to sample the signal and display it on a LCD screen ¤ Have usually more functions than the analog oscilloscopes, like storage, automatic measurements, and computation of simple function on the acquired signals (FFT …)
- 6. Different kind of oscilloscopes ¤ USB oscilloscopes ¤ These are similar to the digital oscilloscopes, but rely on your computer to operate it & display the data ¤ They are usually much cheaper and more portable than digital oscilloscopes ¤ However, usually they have lower performances compared to a typical digital oscilloscope
- 7. Main characteristics ¤ As they are the most commonly used today, especially for portable oscilloscopes, we will talk about some characteristics of digital oscilloscopes ¤ Bandwidth : it is a measure of the maximum frequency that can be measured and displayed with the oscilloscope. It is usually the frequency at which the attenuation reach -3 dB ¤ Sampling rate : the maximum number of measurement points per second that the oscilloscope can acquire
- 8. Operating your oscilloscope ¤ There are basically two main parameters to set when using an oscilloscope : the voltage axis, and the time axis ¤ Setting the voltage axis is done via the volts/div knob. You will usually set it to display the voltage trace on the whole screen of the oscilloscope.
- 9. Operating your oscilloscope ¤ The other knob to set is the time/div knob. If you are observing a periodic signal, use it to set the time axis so that you see some periods of the signal on the screen.
- 10. Thank you ! And find more on our website : http://www.useoscilloscope.com