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--- ebpg_graphic_manual [2025/11/06 23:35] – [e_line] fabian
+++ ebpg_graphic_manual [2025/11/06 23:50] (current) – [Defining the origin] fabian
@@ Line 44: / Line 44: @@
 ===== Defining the origin =====
-Define the origin of the global coordinate system on your sample. Typically this is the lower left corner of your sample. To find the sample, CTRL + click on the schematic of the sample holder somewhere you know your sample won't be. Once the stage finished moving, turn on the electron beam by clicking on the blanker button in e_line.
+Define the origin of the global coordinate system on your sample. Typically this is the lower left corner of your sample. To find the sample, CTRL + click on the schematic of the sample holder somewhere you know your sample won't be. Once the stage finished moving, turn on the electron beam by clicking on the blanker button in e_line. Should you accidentally see your sample already, immediately blank the electron beam again and move off your sample.
+Once you see an image in VegaTC, slowly move towards your sample's edge. Keep an eye on the scale bar at the bottom of the VegaTC image window and make sure not to accidentally overexpose too much of your sample once you find it. With your sample located, move to the bottom left corner of the sample. Go to a zoom level >1000x, turn on the cross hair in VegaTC and precisely locate the corner.
+----
+:!:This step is particularly important if you're planning to perform overlay patterning. The origin is the first point of reference for alignment.
+----
+In e_line, click on the XY-UV-tab (third tab from the top in the vertical tab bar). Select //Origin Correction//, then click //Adjust//. The corner is now the origin of your coordinate system. Distances are displayed with respect to this point.
+{{ :images:cleanroom:software:eline_coordinates.png?300 |}}