Oscilloscope introduction and function

Oscilloscopes are the most important instruments in electronic testing. Oscilloscopes are also divided into analog and digital oscilloscopes. Then, in order to understand more easily, everyone can learn the role of the oscilloscope together.

The role of an oscilloscope

1, can measure the voltage amplitude of DC signal, AC signal

2. The period of the AC signal can be measured and the frequency of the AC signal can be converted accordingly.

3, can display the waveform of the AC signal.

4, can use two channels for signal measurement.

5. The waveforms of the two signals can be displayed on the screen at the same time, that is, double trace measurement. This effect can measure the phase difference between two signals and the difference in shape between the waveforms.

Second, the role of the oscilloscope panel knob

1. The sweep speed knob can change the speed of the oscilloscope scan line from left to right.

2. The voltage selection knob can change the input voltage to make the scan line's deflection in the y-axis direction of the oscilloscope screen.

3, adjust the knob up and down, left and right adjustment knob, you can change the scan line in the screen up and down and left and right directions in two directions.

4. The state where the voltage standard knob reaches the maximum value in the clockwise direction is the standard state. Other positions are non-standard.

5, scanning speed standard knob to reach the maximum value in the clockwise direction is the standard state. Other locations are non-standard.

6, for the synchronization knob, it can make the oscilloscope waveform stabilized.

7. The function selection keys are CH1 channel selection, CH2 channel selection, and double-track selection.

8, role selection key for CH1 signal synchronization, CH2 signal synchronization.

9, to select the switch for measurement, can make the measurement with the AC DC, DC AC, and ground GHD three states. When in the DC-DC state, measurements can be made with either DC or AC signals. When in the AC AC state, the oscilloscope measures a capacitor on the string inside the interface. At this time, the DC component in the signal is blocked by the capacitor, and the AC component can be measured through the capacitor.

When grounded, the oscilloscope's measurement interface is shorted to ground within the oscilloscope, and external signals cannot enter the oscilloscope.

10, for the brightness adjustment knob, you can adjust the brightness of the image.

11. To adjust the focus knob, the image can be made fine.

Third, the oscilloscope to measure the voltage measured method

1, measuring the voltage reading

The oscilloscope scan line is deviated by a square in the Y axis direction, and the measured voltage value is equal to the voltage indicated by the voltage selection knob. The signal voltage multiplies the oscilloscope scan line in the Y-axis direction by the voltage indicated by the voltage selector knob, which equals the voltage value of this signal.

2, measure the cycle of AC voltage

Each time the oscilloscope scan line moves in the X-axis direction, the elapsed time is equal to the time indicated by the scan speed knob. AC voltage A complete waveform The number of grids occupied by the oscilloscope in the X axis direction multiplied by the time indicated by the sweep speed knob is equal to the period of this AC voltage.