| 摘要 |
PURPOSE:To achieve a higher measuring accuracy, by providing a data processing means which moves a conductive film to perform a temperature correction for the area resistance measured based on signals from an eddy current detector and a temperature detector. CONSTITUTION:A conductive film 3 wound on a winding roll 5 is wound on a winding roll 6 being supported with a transfer roll 4. As eddy current of the conductive film 3 is almost proportional to the area resistance, the area resistance can be measured from an output signal of an eddy current detector 1. But the eddy current detector 1 is so susceptible to the effect of ambient temperature that the relationship varies between the output signal of the eddy current detector 1 and the area resistance with variations in the ambient temperature. So, the temperature near the eddy current detector 1 is measured with a temperature detector 14 and based on a signal from the temperature detector 14, a temperature correction is done for the output signal of the eddy current detector 1 at a data processing section to cancel the effect of the temperature on the area resistance measured thereby improving the measuring accuracy. |
