Compare history values

Use the Snapshot command to quickly compare the same value at different points in time. The Snapshot command takes a "picture" (snapshot) of all values for all parameter references at a specific point in time. The snapshot stays open when you select another time and serves as a reference point for comparison.

To compare values

  1. Click the graph time at which you want to take a snapshot, and then click Chart → Snapshot.
  2. Leave the Snapshot window open and select the time at which you want to compare values with the snapshot time. Read the new value from the Value column in the Legend and compare it against the value shown in the Snapshot dialog.