Method and device for configurable ground monitoring of a workbench

A device for configurable ground monitoring of a workbench, comprising:

• an operator ground connection detecting unit detecting if an operator performs a ground connection via a dual wrist strap and providing a circuit for calculating an operator ground resistance and an operator ground voltage;
• an operator ground resistance and ground voltage detecting unit generating a voltage signal of the operator ground resistance and the operator ground voltage, and determining if the operator is in a standby state without the ground connection;
• a mat ground resistance detecting unit providing a closed loop circuit for measuring a voltage signal corresponding to a mat ground resistance;
• an equipment ground resistance detecting unit providing a closed loop circuit for measuring a voltage signal corresponding to an equipment ground resistance;
• an application-specific processor reading the measured voltage signals provided from the operator ground resistance and ground voltage detecting unit, the mat ground resistance detecting unit, and the equipment ground resistance detecting unit to determine an overall monitoring status;
• wherein the application-specific processor summarizing, averaging and transferring measured analog signals into a digital data, and the application-specific processor then comparing the digital data with the digital limit-value for determining if an alarm sounds;
• wherein a timer counter is used when the operator is in the standby state without the ground connection, the alarm is sounded when the operator did not insert the dual wrist strap into the operator ground connection detecting unit for more than a predetermined time period;
• a ground unit being an essential element for constructing the closed loop circuits of the operator ground resistance circuit, the mat ground resistance circuit, and the equipment ground resistance circuit separately;
• and
• a communication connection unit connecting the application-specific processor and providing an interface between the application-specific processor and a PC or an external controlling unit.