FISCHER FISCHERSCOPE X-RAY XDLM 231, Operator'S Manual

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FISCHERSCOPE ® X-RAY 51
Position Specimen
7 Position Specimen
There are some basic rules for positioning specimens. For each measurement it must be ensured
that the x-ray fluorescence radiation can reach the detector without obstruction. Otherwise, the
measurement result may be falsified.
7.1 Flat Specimens
Positioning flat specimens is simple.
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Place the specimen flat on the table and position the desired measurement location.
7.2 Cylindrical or Curved Specimens
Bolts, rods or other cylindrical specimens must be positioned such that they are not shadowed or
that the curvature does not influence the measurement result.
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Position cylindrical specimens on the table in the manner shown in the following figure.
Figure 7.1: Positioning of the specimen for cylindrical or curved specimens
Regardless of the positioning, cylindrical or curved specimens must always have a minimum diam-
eter or a minimum curvature diameter. If the diameters are smaller than this minimum value, then
a greater coating thickness than the actual value will be displayed. This is caused by the effectively
inclined radiation through the coating at the measurement location, which causes a higher fluores-
cence intensity.
The following applies to simple measuring applications (e.g., single coating applications) and in
one plane cylindrical or curved objects):
This means that the diameter of the specimen must be at least four times as large as the diameter
of the measurement spot.
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Specimen
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Measurement spot
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