Function application of oscilloscope and precautions for use

       Functional application of oscilloscope: used to measure the shape of alternating current or pulse current wave, can transform invisible electrical signals into visible images; can observe various waveform curves of different signal amplitudes over time, and can also test various Different kinds of electricity; measure the voltage amplitude and frequency of various waveforms; measure the phase difference between two sinusoidal voltages.
　　The oscilloscope uses a narrow electron beam composed of high-speed electrons to hit the phosphor-coated screen to produce tiny spots of light. Under the action of the measured signal, the electron beam is like the tip of a pen, which can draw the change curve of the instantaneous value of the measured signal on the screen.
　　Precautions in the use of oscilloscope:
　　1. The oscilloscope should generally be turned on and off frequently.
　　2. If you find that the waveform is interfered by the outside world, you can ground the oscilloscope case.
　　3. The voltage of "Y input" should not be too high to avoid damage to the instrument, and it should not exceed 400V at the maximum attenuation. When the "Y input" wire is suspended in the air, interference waveforms will appear due to external electromagnetic interference. This phenomenon should be avoided.
　　4. Before turning off the machine, turn the brightness adjustment knob counterclockwise to the end to minimize the brightness, and then turn off the power switch.
　　5. When observing and adjusting the bright spots on the screen, the brightness of the bright spots should be moderate and not too bright.