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g)
Graphical analysis
This analysis is performed using data from the data base. Therefore, the device no longer has to be
connected. For the selection of the data base see item b) above.
An analysis function may consist of multiple measured quantities, which can be graphically displayed at the
same time. Thereby also a calculation of aggregates or differences can be made, e.g. to build the sum
of feeders in a transformer station or to calculate the resulting net energy of incoming minus outgoing
energy. Once defined an analysis function may be stored for later re-use.
1
In the first step quantities must be added to the analysis function. These will be displayed in the
measurement list on the left. In the example above the calculation of a sum of three quantities is shown.
To do so, the quantities from the database (2nd, 3rd and 4th) must be shifted to the right. The resulting
quantity is automatically a sum. A difference is achieved almost the same way. To the first and third
quantity a measured quantity is assigned, the quantity in the middle will automatically be the difference.
2
Select measurement device. All devices are selectable, for which measurement data have been stored
in the data base. A description can be assigned to the list quantity. Note: The input of a description text
must be terminated by <ENTER>, otherwise the text is not accepted.
3
Select quantity type (meter, mean-value t1 or t2, min/max values, alarms)
4
Select measured quantity. Only measured quantities are provided which have entries in the data base.
Because the logger may have recordings with different device configurations a pre-selection of a logger
sequence with unique configuration must be performed.
5
For the analysis a starting and ending time can be defined.
6
Once the function is completed it can be saved on disk. So next time the same function can be loaded
from disk without the need to define the function again. When all quantities from the measured
quantities list are defined the graphical analysis can be displayed.
