Conductivity And Impedance Measurements
The ProboStat test fixture allows many ways to connect to the sample.
Disk sample:
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2-point impedance spectroscopy and conductivity measurements
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2-point impedance spectroscopy and conductivity measurements with surface guard
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van der Pauw 4-point conductivity measurements
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Electrode impedance studies with ring reference electrode – symmetrical cells
Bar sample:
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4-point conductivity measurements
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Seebeck coefficient measurements
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Combined Seebeck coefficient and 4-point conductivity measurements on bar sample
Example schematics of 2-point 4-wire conductivity and impedance measurement.
Crude picture of the same setup.
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Left: the bottom electrode pushed up
by the inner gas supply tube
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Middle: sample, thermocouple and top
electrode
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Right: spring load assembly pulling the
setup tightly together
Van der Pauw
Van der Pauw measurements are suitable whenever you need to characterise a highly conducting material with a four point method and the sample is readily available as a thin slab.
For more information see ProboStat manual section 8.2.5.
