This is the case. When I used my 5440D MSO oscilloscope for testing, I found that the signal cannot be triggered with a trigger voltage of 0V in the ±100V range:
But when I increase the trigger voltage a little, for example, 800mV, it can be triggered normally;
Or, Choose a smaller range, such as ±50V, even if the trigger voltage is 0V, it can be triggered normally.
Why is this?
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