1) Test steps (a) Plug in the power cord of the oscilloscope, turn on the power switch, and the power indicator light is on. After the scan line appears, adjust the brightness to the appropriate position, adjust the focus control, and make the scan line the thinnest. (b) Adjust the baseline knob so that the scan line is parallel to the horizontal scale line. (c) Turn the fine adjustment/expansion control switch knob clockwise to the calibration position. To avoid measurement errors, the probe should be inspected and corrected before measurement. The calibration method is: connect the probe to the corrected square wave output of the oscilloscope, and adjust the compensation capacitor of the correction hole on the probe level until the square wave displayed on the screen is a flat top. (d) The volt/degree selection switch, the working mode switch, and the scan time selection switch are placed in appropriate positions according to the size of the signal to be measured and the frequency. (e) Place the input coupling switch in the "GND" position to determine the position of the zero level. Then put it in the "AC" position, input the signal to be measured by the probe, adjust the synchronous switch knob to make the waveform stable, observe the amplitude of the signal waveform displayed on the screen in the vertical direction, and multiply the voltage V/DIV of the measured signal and the display degree. When using a 10:1 input probe, the screen will display the amplitude value &TImes;10. 2) Things to be aware of during measurement (a) When measuring, do not place the meter in a place with a strong magnetic field nearby. (b) The amplitude of the signal under test cannot exceed the specified withstand voltage at each input of the oscilloscope to prevent the oscilloscope's amplifier from being burned out. (c) When testing, the oscilloscope's casing should be suspended to avoid short circuits. (d) The AC voltage measured by an oscilloscope is a peak-to-peak value. (e) The test line should be as short as possible, and the probe should be close to the measured point, otherwise it may cause waveform distortion.
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