Oscilloscope measurements, how to use an oscilloscope

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Green, Leslie O. Analog Seekrets: DC to Daylight. - Future loan data Research Press, 2007. - ISBN 9780955506406.
An oscilloscope is an effective modern device designed to measure the frequency parameters of electric current over time and to display them graphically on a monitor or record them using self-recording devices. It allows you to measure such characteristics of electric current inside a circuit as its strength, voltage, frequency and phase shift angle.
Why do you need an oscilloscope?
There is no laboratory that could function for a long time without measuring devices or sources of signals, currents and voltage. If you plan to design or create high-frequency devices (especially serious computing equipment, say, inverter power supplies), then an oscilloscope is not a luxury, but a necessity.
It is especially good because it helps to visually determine the shape of the signal. Most often, it is this shape that shows well what exactly is happening in the measured circuit.
The center of all oscilloscopes is a cathode-ray tube. You could say that it is like a radio tube, inside, accordingly, there is a vacuum.
The cathode emits electrons. The installed focusing system creates a thin beam of emitted charged particles. A special phosphor layer covers the entire screen inside. Under the influence of the charged electron beam, a glow occurs. Observing from the outside, you can see a luminous point in the center. The beam tube is equipped with two pairs of plates that control the beam created in this way. The electron beam operates in perpendicular directions. As a result, two control systems are obtained that create a sinusoid on the screen, in which the vertical denotes the voltage value, and the horizontal - the time period. Thus, it is possible to observe the parameters of the voltage supplied to the device in certain time intervals. Depending on the type of signal supplied to the oscilloscope, it can be used to measure not only voltage parameters, but also other values ​​of a particular unit being tested.
What are they like?
Currently, there are two types of oscilloscopes in common use: analog and digital (the latter is more convenient, has more advanced features, and is often more accurate). Both operate on the same principle, and the methods for measuring physical quantities listed below can be used on any model of this device.
Correct connection