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NORMAL mode and HIGH-RES mode affect the waveform's voltage

Question asked by Luca on Aug 16, 2015
Latest reply on Aug 17, 2015 by algoss
There is an issue I faced in 3000 series as well as 4000 series scope.
When we adjust the time-base setting in NORMAL mode, (horizontal ****), the waveform’s voltage is fine.

Once we changed to HIGH-RESOLUTION mode, and we adjust the time-base setting, the waveform’s voltage decrease proportional to the increase of the time-base.
Is it a bug on most of the scopes?