After switch to 'Channel Table' and switch to 'after 2D Axis system' now I can see the Time and the data. But something is wrong in comparison with the speed curve alone. With the timestamp the curve is not linear (curve 5)
And the curve without the time. You can see it's linear but what is mean exactly : X Y dX and 1/dX ? I just need to find the frequency.
If you show only the Y channel, then DIAdem plots this channel against the index.
To analyze the signal characteristic, you can also use this function in ANALYSIS:
Thank you for your helps, this is outside the scope of the topic I may be opening another topic to analyze signals. Thank you for your help.