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Edited by Oleg10011001 at 2019-11-30 04:43
For example, I want to measure the level of ripple at the output of a switching power supply. I turn on the closed input mode on the desired channel of the oscilloscope to see only the variable component of the signal and press the "AUTO SET" button in the hope that after performing this function, the oscilloscope will show the voltage ripple waveform on the screen so that you can see their shape, frequency and estimate the amplitude . That is, I expect that the "AUTO SET" function will work in the conditions set by me, and not the way she wants. However, suddenly everything happens wrong and I get something completely different and all because the function of the "AUTO SET" button spontaneously switches the desired channel to open input mode and only then tries to tune in to the signal. I think this is the erroneous behavior of the oscilloscope. I also add that if you set the afterglow mode of the waveform on the screen to any value other than "Auto", then after pressing the "AUTO SET" button, the afterglow mode will spontaneously switch to "Auto" mode. I think this is the erroneous behavior of the oscilloscope. I believe that when the "AUTO SET" functions are running, only the vertical and horizontal scan, as well as the trigger settings and its level of operation, can change. This function should not change other settings.
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