Zeiss METROTOM 1500 G3, Operating Instructions Manual, Page: 79 / 120

Setting up the workpiece and measurement
61211-8140502 METROTOM 1500 G3 1.4
7-7
Irradiation length
A Horizontal position of the workpiece
W Inclined position of the workpiece
1 X-ray beams
2 Long distance; radiation penetration over the entire length of the workpiece
3 Short distance
Holder and clamping
Adapt the form and the material of the holder to the
workpiece.
Polystyrene
Polystyrene is an ideal material for clamping. Main advantage: Little ab-
sorption of the X-ray radiation.
The polystyrene used should have the following characteristics: bright,
solid, brittle and not shapeable.
NOTE
Polystyrene is compressed under the weight of the workpiece. This
property has a negative influence on the accuracy of the measurement.
Therefore, you should fasten the workpiece in the polystyrene block
and let it rest for at least one hour prior to the measurement. After-
wards you must handle the polystyrene block with care. Avoid any de-
formation.
Furthermore, you must also consider the high thermal expansion of
polystyrene. In case of unfavorable shape and size of the polystyrene
block, even the heat of the hand may cause a workpiece movement by
several micrometers. It is therefore important that the polystyrene block
has the same temperature as the X-ray chamber.