I have a column filled with values with a specific sampling intervall (dt=0,001s). Now I want the Maximum for every second. I am an absolut newbee in OriginPro.
As you are using OriginPro, you can run the "Reduce by Group" tool (under "Analysis: Data Manipulation" menu). As in the screenshot, you can set Max values as the representative value of the group. Also, it can produce X column from the average, etc. of the group.