Method of observing electrical signal waveform in oscilloscope measurement-EEWORLD

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　　An oscilloscope is an electronic measuring instrument with a wide range of uses. An oscilloscope uses the characteristics of an electronic oscilloscope tube to convert alternating electrical signals that cannot be directly observed by the human eye into images, and displays them on a fluorescent screen for measurement. It is an important instrument that is essential for observing digital circuit experimental phenomena, analyzing experimental problems, and measuring experimental results. An oscilloscope consists of an oscilloscope tube and a power supply system, a synchronization system, an X-axis deflection system, a Y-axis deflection system, a delay scanning system, and a standard signal source. An oscilloscope is an instrument used to measure the shape of an alternating current or pulse current wave, and is composed of a tube amplifier, a scanning oscillator, a cathode ray tube, etc. In addition to observing the waveform of the current, it can also measure frequency, voltage intensity, etc. Any periodic physical process that can be converted into an electrical effect can be observed with an oscilloscope. There are many brands of oscilloscopes, among which Tektronix oscilloscopes are the world leader in oscilloscopes. The following introduces the steps for using an oscilloscope to observe the waveform of an electrical signal.

　　1. Select the Y-axis coupling mode

　　According to the frequency of the signal to be measured, set the Y-axis input coupling mode selection "AC-ground-DC" switch to AC or DC.

　　2. Select the Y-axis sensitivity

　　According to the approximate peak-to-peak value of the measured signal (if an attenuation probe is used, it should be divided by the attenuation multiple; when the coupling mode is set to DC, the superimposed DC voltage value should also be considered), set the Y-axis sensitivity selection V/div switch (or Y-axis attenuation switch) to the appropriate level. In actual use, if it is not necessary to read the measured voltage value, the Y-axis sensitivity fine adjustment (or Y-axis gain) knob can be appropriately adjusted to make the waveform of the required height appear on the screen.

　　3. Select the trigger (or synchronization) signal source and polarity

　　Usually the trigger (or synchronization) signal polarity switch is set to the "+" or "-" position.

　　4. Select scanning speed

　　According to the approximate value of the measured signal cycle (or frequency), set the X-axis scanning speed t/div (or scanning range) switch to the appropriate level. If it is not necessary to read the measurement time value in actual use, the scanning speed t/div fine adjustment (or scanning fine adjustment) knob can be appropriately adjusted to display the waveform of the required number of cycles on the screen. If the edge of the signal needs to be observed, the scanning speed t/div switch should be set to the fastest scanning speed.

　　5. Input the signal to be measured

　　After the measured signal is attenuated by the probe (or directly input through the coaxial cable without attenuation, but the input impedance is reduced and the input capacitance is increased), it is input into the oscilloscope through the Y-axis input terminal.

　　The use of an oscilloscope varies depending on the measurement situation. It may be different in different measurements, but the general situation is the same. The above content is for reference only.

Reference address：Method of observing electrical signal waveform in oscilloscope measurement

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