(IUCr) CIF Definition save__diffrn_detector_element.reference_center_fast

DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary | Draft version 1.5 for comment

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Index

##### Image dictionary (imgCIF) version 1.5.4

# _diffrn_detector_element.reference_center_fast

Name:
`'_diffrn_detector_element.reference_center_fast'`

Definition:

           The value of _diffrn_detector_element.reference_center_fast is
                  the fast index axis beam center position relative to the detector
                  element face in the units specified in the data item
                  '_diffrn_detector_element.reference_center_units' along the fast
                  axis of the detector from the center of the first pixel to
                  the point at which the Z-axis (which should be colinear with the
                  beam) intersects the face of the detector, if in fact is does.
                  At the time of the measurement all settings of the detector
                  positioner should be at their reference settings.  If more than
                  one reference setting has been used the value given whould be
                  representive of the beam center as determined from the ensemble
                  of settings.

                  It is important to note that for measurements in millimetres,
                  the sense of the axis is used, rather than the sign of the
                  pixel-to-pixel increments.

Type: float

Mandatory item: no

Category: diffrn_detector_element

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Copyright © 2005 International Union of Crystallography