Oscilloscopes and function introduced basic instructions – Oscilloscope – Educat
Oscilloscope The basis of instructions and functions
We can simply as the oscilloscope is a graphic display of the voltage meter.
Common voltage table is moving in its dial indicator or digital display to give the signal to the measurement readings. The oscilloscope is and common difference. Oscilloscope with the screen, the screen can be displayed graphically signal voltage changes with time, that waveform.
Oscilloscope and the voltage meter is the main difference between:
1. Voltmeter to measure signal values given in Cheung, this is usually the RMS value of RMS. But the voltage meter can not give the signal shape information. Some voltage meter can measure the signal peak voltage and frequency. Nevertheless, the oscilloscope is able to graphically display the signal over time the history.
2. Voltmeter usually only measure a signal, while the oscilloscope is able to simultaneously display two or more signals.
Display System Oscilloscope display devices are cathode ray tube, abbreviated as CRT, see Figure 1. Based on cathode ray tube can produce a Electronic The system, known as the electron gun. Electron gun to the screen emit electrons. Electronic emission electron gun formed by focused electron beam, and hit a point in the center of the screen. The inner surface of the screen is coated with fluorescent material, so that electron beam hit the point on the issue to light.
Figure 1 cathode ray tube map
Electrons from the electron gun to the screen the way to go through a deflection system. Voltage on the deflection system can make points of light moving across the screen. Deflection system consists of horizontal (X) and vertical deflection plate (Y) deflection plates. This is called electrostatic deflection, deflection.
The inner surface of the screen or corrosion of the method used to characterize a number of horizontal and vertical lines form a network known as the ruler. Ruler in vertical direction is usually 8, the horizontal direction 10, each cell is 1cm. Some gauge wire are further divided into small cells, and also indicate the 0% and 100% of the special line. These special lines and marked 10% and 90% of the scale for use with rise time measurements. We will discuss this issue later.
As noted above, after the bombardment by the electron, CRT will be light on the fluorescent material. When the electron beam removed, the fluorescent material in a short period of time will continue to light. This time is known as afterglow time. The length of afterglow fluorescent material with vary. The most commonly used fluorescent material is P31, its afterglow time of less than one millisecond (ms). While the afterglow fluorescent material P7 time was longer, about 300ms, This is very useful signals observed slower. P31 launch green materials, while P7 luminescence of yellowish green color.
The input signal added to the Y-axis deflection board, and the oscilloscope to make their own electron beam along the X axis scan. This makes the light point on the screen depicts the input signal waveform. Such as sweeping out the signal waveform waveform trajectory.
Impact of the screen and control institutions are:
Brightness
Brightness control to adjust the brightness of wave-shaped display. Book as an example of the oscilloscope can be used in the circuit depending on the scanning speed automatic brightness adjustment cut. When the electron beam moving too fast, the fluorescent material by the excitation time becomes shorter, so must increase the brightness to see the track. On the contrary, when the electron beam movement is slow, the screen becomes very bright point of light, it must reduce the brightness so that fluorescent substances are burned. Thus extending the life of CRT.
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