There are errors in the oscilloscope experimental system. What are the reasons?

An oscilloscope is an instrument used to measure the shape of alternating current or pulse current waves. It consists of a tube amplifier, a scanning oscillator, a cathode ray tube, etc. So what are the causes of oscilloscope experimental system errors?

The curve data displayed by the oscilloscope generally includes frequency, amplitude, and phase relationships, which can be discussed separately during analysis. Systematic errors can be reduced by improving experimental equipment and perfecting experimental methods, but it is almost impossible to eliminate them; accidental errors can be reduced by averaging multiple experiments, but they cannot be completely eliminated. In fact, as long as it is within the allowable error range, the data is valid and the experiment is reliable.

What are the reasons for errors in the oscilloscope experimental system?

What are the causes of system errors in oscilloscope experiments?

Causes of system errors in oscilloscope experiments:

1. There are systematic errors in the machine system;

2. Sampling rate. The sampling rate is not enough to correctly restore the waveform;

3. The oscilloscope image has thickness, which causes errors in the results;

4. The bandwidth of the oscilloscope is not enough, and high-frequency signals cannot enter, which will naturally produce large errors;

5. The oscilloscope’s recording length is not long enough to display the complete signal;

6. Probe accuracy;

7. The vertical accuracy of the oscilloscope, that is, if there are not enough vertical digits, there will be errors in the amplitude measurement accuracy;

8. Oscilloscope channel impedance. If the impedance does not match, there will be a large error in the amplitude measurement;

9. The two signal generators are not coordinated.