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SPECTANO 100 User Manual
Flatness
The surface of the test material must be flat at all points. If the surface of the test
material is not flat, an air gap between the electrode and the solid test material
causes measurement errors.
Figure 7-1 Example of a non-uniform solid material sample
The thickness must be determined systematically over the area of the solid material
that is used in the electrical measurement and shall be uniform within
±1% of the average thickness.
Note:
Measurement errors caused by non-uniformity have a high influence when
the solid test material is thin.
7.1.3
Electrode adjustment of solid material test cells
Adjust the two electrodes until they are parallel to each other for accurate measurement. Moreover,
ensure that also the solid test material is fully contacted (parallel). Perform this adjustment in the following
cases:
•
Before starting a measurement
•
After changing the electrodes or the sample
The following figures show examples of a correct and wrong adjustment of one example test cell.
Contact
Figure 7-2
Correct (left picture) and wrong (right picture) adjustment of the test
cell
Note:
The adjustment procedure and kind of adjustment depend on the used test cell. Read the test
cell manual for more information on the test cell specific adjustment procedure.
For more information on sample dimension or test setup improvement, see our application notes
Gap
