85
Measuring Flat Sample
(2) Measurement with the guard electrode
Because the current owing through the measured object ows out through the guard electrode to the external
power supply, the current owing along the surface of the measured object can be separately measured with
accuracy.
A
(+)
(−)
Internal ammeter of the insulation meter
Current to be measured owing
along the surface
Current owing through the measured object
Measured object
Guard electrode
Main electrode
Counter electrode
Base (insulator such as a table)
Internal
power
supply of the
insulation
meter
5
Measurement Methods Suitable for Various Objects to Be Measured
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