Measurement individual difference correction system in ground voltage measurement

A measurement individual difference correction system for measuring voltage to ground, comprising:

• a cable comprising a conductor;
• a counter earth ground surface electrode provided on a floor;
• an oscillation circuit connected between the cable and the counter earth ground surface electrode, and configured to output a signal;
• a voltage-to-ground measurement device comprising an upper electrode and a lower electrode positioned apart from each other, and configured to measure voltage between the upper electrode and the lower electrode;
• a capacitance-to-ground measurement device configured to measure capacitance to ground;
• and
• a computation device in communication with the voltage-to-ground measurement device and the capacitance-to-ground measurement device,
• wherein when a user touches the cable while wearing shoes of which a sole of one shoe comprises the voltage-to-ground measurement device installed therein and of which a sole of the other shoe comprises the capacitance-to-ground measurement device installed therein, the computation device calculates combined impedance of electrostatic capacity between the user and the cable, impedance of the user, and electrostatic capacity between the user and the upper electrode, by using voltage of the signal output from the oscillation circuit, the voltage between the upper electrode and the lower electrode measured by the voltage-to-ground measurement device, and the capacitance to ground measured by the capacitance-to-ground measurement device.