1, experimental summary: Compared with other experiments, this experiment is closer to an experiential experiment, the purpose is not to obtain the final experimental data results, but to let us better understand the oscilloscopes commonly used in actual production and life; By operating the oscilloscope, on the one hand, we can be familiar with the use of the instrument and realize the gap between book theory and actual operation, on the other hand, we can also understand the method of transforming some invisible dynamic quantities into another quantity in the oscilloscope (the combination of sawtooth wave scanning voltage and signal voltage is the essence of its expression).

In addition, in this experiment, I also realized the difference between theoretical knowledge in books and practical application, specifically, the difference between theoretical value and actual pattern of full-wave shaping current waveform. Through practical operation and observation, I can start from differences, start from some mistakes, and better understand what I have learned from different angles through comparison, which can't be done by reading alone.

2. Error analysis:

There are several possible reasons.

1. Influence of desktop vibration.

2. The fluorescent lines displayed on the oscilloscope are relatively thick, and the width between the fluorescent lines is not allowed when the voltage value is taken, resulting in the voltage value not allowed.

3. When taking sinusoidal period, the naked eye can't accurately adjust the width between two fluorescent lines, which leads to inaccurate determination of the period.

4. Jumping up and down when choosing the value of fy may lead to inaccurate value.

5. There are systematic errors in the machine system.