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I saw a thing on my GDS-1052-U oscilloscope: if I set the time base to 25mS/div there appear a delay of the signal on the screen. So, when I rotate the knob for the time base to 25mS/div, there is a delay until the trace appear on the screen. If I set the time base to 5mS/div there is almost no delay. If I set the knob for 10mS/div the delay is smaller than the delay for 25mS/div. This happens on both channels. The probe is not connected to any signal source while I do these things. The voltage/division is 20mV/div. Is that normal ?

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    \$\begingroup\$ You should include a screenshot so we can see what you're doing. Accurate delays can only be measured between two traces, not how long it takes for the trace to appear on the screen, that actually means nothing. How fast the trace appears on the screen also depends on when the scope actually triggers and how long it takes to process the data. Maybe the amount of samples changed between timebase settings so processing takes longer. \$\endgroup\$ – Bimpelrekkie Jan 28 '18 at 15:33
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    \$\begingroup\$ This is not unusual at slow timebase settings; does the status show 'untriggered roll' or 'auto roll'? \$\endgroup\$ – Peter Smith Jan 28 '18 at 15:36
  • \$\begingroup\$ I made a video @Bimpelrekkie youtube.com/watch?v=pqC2zcKXTrY&feature=youtu.be \$\endgroup\$ – mike_mike Jan 28 '18 at 15:42
  • \$\begingroup\$ @oldfart The trigger point is on the screen. It can be seen on the right side of the screen. \$\endgroup\$ – mike_mike Jan 28 '18 at 15:45
  • \$\begingroup\$ My comment came at the same time as you link to the video. I'll delete it. \$\endgroup\$ – Oldfart Jan 28 '18 at 15:49

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