3. Electrical measurement techniques
After these basic aspects, we'll present the various measurement techniques in detail, specifying the quantities that can be reached.
The insulating test piece can be regarded as a capacitor. When DC voltage is applied, a transient current first appears (known as the "absorption current", due to the various polarization phenomena – figure
1
). After a period of time, which can be considerable, this current can tend towards an equilibrium value known as the "conduction current", i
c
. Resistivity can then be calculated using this definition of conduction current.
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Electrical measurement techniques