Time comparison chart

The time comparison chart allows two channels to be analysed on different time axes. The two time axes can have any time offset relative to one another. Convenient features such as pan and zoom, along with a wide range of display options, provide the user with a powerful tool.

Chart properties

Legend

Specifies which columns are displayed in the chart legend.

Toolbar

Chart
	Refresh	Reloads the data from the database and updates the chart. Please note: any unsaved changes will be overwritten by the most recent version stored in the database.
	CSV download	Generates a CSV data file and enables the browser’s download/save function.
	Properties	Opens a dialog box containing the chart properties. Here, you can, among other things, show or hide the columns in the legend.
Display (not available for all chart types)
	Time chart view	Values for the current time range are displayed in a level (x)–time (y) view. Depending on the measured variable, the level can be displayed as a line, a bar or point.
	Value table view	The values for the current time range are displayed as a table.
	Frequency distribution view	Values in the current time range are sorted by value rather than chronologically by time.
Time range
	Day view	The time range is scaled to one day.
	Week view	The time range is scaled to one week.
	Month view	The time range is scaled to one month.
	Quarter view	The time range is scaled to a quarter.
	Year view	The time range is scaled to one year.
	Display entire time range	The entire time range available in the database is loaded and the view is scaled accordingly.
	Custom time range	The display range can be customised by specifying a start and end date.
Navigation
	Go to the first record	The first available data is loaded and displayed within the currently selected time range.
	Go to the previous range	Displays the previous range.
	Go to the next range	Displays the next time range.
	Go to the last record	The most recent available data are loaded and displayed within the currently selected time range.
Show legend
Allows you to show or hide the legend.

Adjusting the offset between the two time axes

Please note the padlock icon for the two time axes. If this is closed, then when navigating using the buttons, both time axes are moved simultaneously. If it is open, only the currently selected axis is moved. You can switch between open and closed by clicking on the padlock icon.

The following procedure has proved effective for setting the time offset:

Use the buttons to set the desired time interval.
Open the lock to unlock the connection between the two time axes.
Use the button to move one time axis by the specified interval.
Now lock the connection again by clicking on the padlock icon

Navigation on the value axis

Each measured variable is displayed on a scale corresponding to the unit. Up to four independent value scales can be defined per chart. Right-clicking on the relevant scale allows you to switch between automatic and manual scaling. In automatic mode, the highest value loaded from the database determines the upper scale limit. By holding down the left mouse button, you can move the scale range up or down. By using the mouse scroll wheel within the scale area, you can also zoom on the value axis.

Channel properties

Name/Designation/Title	A meaningful text entry. The designation is used for identification and search purposes and can be changed at any time.
Enabled	Yes / No – Enables or disables the object.
Display measured value information	Yes/No – Additional information can be stored for each record. If information is stored for a record, an indicator can be displayed next to that value in the chart. Clicking on this indicator displays the full measured value information.
Colour	Selection – Allows you to customise the colour for the channel.
Rank	Number – Allows you to set the order of the channels. The order can be crucial when elements overlap. This property can also be changed by dragging the channel with the mouse. The first channel is ranked 0, and so on.

Static lines

Y-axis

Type