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Figure 8-5
When using a guard electrode, the stray capacitances will be guarded as shown in the following figures.
With this setup it is possible to measure the dielectric properties of the solid test material accurately,
because the stray capacitances are not measured. Additionally, the influence of surface currents is
eliminated by the guard electrodes. This is especially important for samples with a high-volume resistivity.
Figure 8-6
1. This image refers to standard ASTM D150-11.
Measurement circuit, unguarded electrode (C
Lines of electric force, guarded electrode
Setup improvements
is stray capacitance)
s
1
23
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