HEIDENHAIN iTNC 530 (340 49x-02) Pilot - Manual (Page 143)

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Zoom function
The TNC features a powerful zoom function for easy recognition of small
details during contour selection.
Function Soft key
Magnify workpiece. The TNC always magnifies
the center of the view currently being displayed.
Use the scroll bars to position the drawing in the
window so that the desired section appears after
the soft key has been pressed.
Reduce workpiece
Show workpiece at original size
If you have a wheel mouse, you can use it to zoom in and
out. The zooming center is the location of the mouse
pointer.
In the SET LAYER and SPECIFY REFERENCE modes you
can move the zoomed-in window with the cursor keys.