Micro Resistance Method
Micro-resistance measuring method according to the standard DIN EN 1457
The probe contacts the specimen surface with 4 electrodes. The two outer electrodes supply a current to the coating. The copper coating between the two inner electrodes serves as an electrical resistor at which the voltage drop is measured.
This is indirectly proportional to the thickness of the copper coating. The measurement signal is converted to the coating thickness value in the measuring instrument using the probe characteristic, the functional correlation between the probe signal and the coating thickness. The electrical conductivity of the copper coating is affected by the temperature, which may make a temperature compensation necessary.