The biggest complaint our customers have and that I have has always been how trending is handled by the Vision charts.
For a point that doesn’t change very frequently, such as the below temperature setpoint (top plot, blue-green colour pen). The chart below is set to Fixed resolution mode with 1200 points.
This is the actual data points in the history for the displayed period above.
As you can see, the setpoint is not ramped down, but is rather changed from 30° to 12° sharply.
If I change the history resolution mode to Raw, it’s far better:
However if I zoom into the chart, it becomes utterly useless:
How have others worked around this? The only way I can see to avoid this is to setup relatively fast logging of history, e.g. set max time between samples to 10s. However this completely destroys the point of using “compression” on the trend data to reduce data points, filesize, and chart performance… If this is just how I have to do it though, then I guess that’s what I have to do…
Are any of these issues resolved in the new Perspective timeseries chart and soon-to-be “EasyChart”?