Defining a SheetScan Coordinate System

You can define a coordinate system for a graph on a datasheet picture that you have previously loaded into the SheetScan editor.

To define the coordinate system:

1. Select Coordinate System > New to open the Coordinate System dialog box.

   

   You can enter points manually or select them using a crosshair.

2. To activate the crosshair cursor, click Point1.

   The cursor transforms into a crosshair.

3. Position the cursor over a corner of the datasheet graph and click the left mouse button.

   The Coordinate System dialog box reappears, displaying the X- and Y-Coordinate values for the chosen point.

4. Enter the X-Value and Y-Value for this point. Typically, these values will correspond to the values taken from the axis scale values on the datasheet.
5. Select the desired scaling (linear, logarithmic, or decibel) for both the X and Y axes.
6. Repeat the above steps for Point2 and Point3.
7. Click OK.

   The grid is placed over the graphic.

   Note:

   • You can edit the grid after placement by selecting Coordinate System > Properties, by clicking the coordinate system icon on the Curve toolbar (), or by right-clicking in the SheetScan editing window and selecting Coordinate System.
   • You can hide the grid by selecting View > Grid.
8. You can now define a Characteristic Curve.