The linear probe calculates the magnetic field along a specified trajectory, and plots the result. The field unit is tesla. To set the points at which the field is calculated trajectory is entered into the Path page of the edit ditalog. Example source code is
resolution 1 mm start 0 0 0 goto 1.3 0 0 cm resolution 0.5 mm goto 1.3 0 2 cm
Points are placed uniformly on each segment, with points on the starting and ending position such that the points are no further apart than the resolution, which can be changed along the trajectory as shown above.
More details about the trajectory specification is given in the file format section.
The plot itself is customized by specifying what variables to plot on the Plot page of the edit dialog.. By default, the field magnitude B is plotted versus the distance s along the trajectory. The x, y, or z components of the field can be plotted as well, with the abscissa given by either x, y, z, or the arclength s.
A macro language function can be specified on the Macro page of the edit dialog. To plot the result of the evaluation of the macro, select macroResult on the Plot page.
Normally the plot autoscales to show all the data. This can be changed by specifying a minimum and maximum ordinate on the Scale page of the edit dialog.
The plot will be displayed in a separate probe product window, which will have the name of the field probe preceded by a capital greek letter "Pi" (for product). This window will update when the field is recalculated.
In the probe product window, the cursor mode is controlled by the icons on the upper left. The selection mode lets you click on a curve an get a display of the parameter value. The zoom mode lets you zoom in on particular areas of the graph. To zoom to fit, which is the same as turning autoscaling on, just click on the zoom icon when already in zoom mode, or use the graphics menu.
Double clicking on the plot will jump you back to the edit dialog so you can change plotting parameters.