Select the trend chart whose sampling mode you want to change.
After you have added a chart(s), select Mode at the top of the page.
Select your Historian Sampling Mode from the drop-down menu.
If your selection for Sampling Mode is Calculated, chose your calculation from the drop-down menu.
Select the Sample Increment from the drop-down menu as either By Size or By Time.
Note: Number of samples by size must be equal to or less than the limit defined by your System Administrator; otherwise, a warning message informs you that the data will NOT be retrieved.
Select Apply to apply to a specific chart, or select Apply to All to apply to all the charts in this analysis session.
Historian