Compaq Graphical User Interface mar345 Manuel d'utilisateur télécharger pdf (Page 22)

ar345 Program Manual 2 2

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.14 X−ray Setup

When producing images during data collection many parameters concerning the curren

experiment are automatically written into the output image headers, so this information ca

be retrieved later on. This is most relevant for parameters like the distance and th

goniometer positions. It might, however, be useful to add also some information about th

state of the X−ray source. Unfortunately, the program mar345 does not have knowledg

about the generator and collimator settings, so this information must be entered manuall

For this purpose, open the mar345−X−ray Setup window. This window can be popped u

manually from the main window menubar or by pressing the F3 key. All information give

here is really not essential but it may help later on to track down problems during dat

processing.

The center of diffraction is supposed to be a physical constant (for one data set) and is val

for all scan modes, regardless if working at 0.15 or 0.10 mm pixelsize. This is why the cente

should not be entered in absolute pixels or millimeters referring to an origin in the lower le

corner but as a deviation from the center of the image plate. These values should be given

mm, not in pixels, and can become negative. Negative x deviation means that the center o

diffraction is left of the IP−center. A negative y deviation would be underneath the IP−center

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Compaq Graphical User Interface mar345 Manuel d'utilisateur Page 22