Hello. When setting up the oscilloscope at a level of 0.1 volts with a capacity of C3, everything is fine. However, after switching the test signal to 3.3 volts, problems begin: with an increase in sensitivity, the beam disappears from the screen. What could be the reason?
Thanks.
![Image](https://img12.lostpic.net/2020/04/22/2c6704c6b2f8f37e05655a4e49dd033a.th.jpg)