History

Whzan has an optional data logger function permitting the storage of individual datapoints. Once data is logged, it is possible to retrieve this data using the screen history charts. These history charts recall data from the history archive when they are generated.

Thereafter the charts update when new data is available on a continuously rolling basis.

Multiple datapoints can be plotted on each chart.  Annotations can be added with the standard text tool as it is possible to overlay objects, on the chart.

Whzan compresses the history data as it is stored to enable us to provide storage resources at a reasonable cost.

A great feature of history is that calculations and functions can be plotted from the raw datapoint values as the data is extracted.  (e.g. datapoint1 + datapoint2). This means that storage can be kept to a minimum and it is possible to create and plot derived data after the storage events.