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Graphs may have additional Y axes to accommodate plotting results with incompatible scales. This occurs particularly for plotting dB and phase against each other and also for voltage and current. The additional Y axes may either be superimposed or stacked. In the user interface and the remainder of this documentation these are referred to respectively as Axes and Grids. These are illustrated below.
When you plot a new curve on an existing graph, SIMetrix will select - or if necessary create - a compatible axis for that curve. The decision is made on the basis of the curve's Units i.e voltage, current etc. The rules it follows are:
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Two toolbar buttons Create new grid and Create new axis allow manual creation of new axes and grids. These will be initially empty. Subsequent random probe operations will use the new axis or grid unconditionally as long as it remains selected (see below).
Some operations are performed on the selected axis or grid. The selected axis or grid will be displayed with its vertical axis line a deep black while the remaining axes and grids will be light grey. Newly created axes and grids are always selected. To select an axis, click the left mouse button immediately to the left of the vertical axis line.
The menu will place each curve on its own grid.
The menu will place each selected curve on its own grid.
You can freely move curves around from one axis or grid to another. Proceed as follows:
To delete an axis, select it then press Erase axis button. Note that you cannot erase an axis or grid that has curves attached to it nor can you erase the Main axis. The main axis is the first axis that is created on a graph. For example with the following graph
You can edit axis scales, label and units by selecting the graph popup menu . This brings up the following dialog box:
You can change the vertical order of the analog grids and digital axes. To change the analog grid order:
To change the digital axis order:
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