Device for registering an on state of a drive motor or a tool, and system

A device for registering an On state of a drive motor of a tool, wherein the device is configured for arrangement on the tool, and wherein a changing magnetic flux is produced in the On state of the drive motor, the device comprising:

• an inductive sensor, wherein the inductive sensor is configured so that a voltage signal is induced in the inductive sensor on the basis of the changing magnetic flux;
• a capacitor, wherein the capacitor is electrically connected to the inductive sensor;
• an amplifier, wherein the amplifier is configured to amplify the induced voltage signal or a signal based on the voltage signal to produce an output voltage signal;
• a first peak hold detector and a second peak hold detector, wherein the first peak hold detector is configured to generate an upper peak signal from the output voltage signal or a signal based on the output voltage signal, and wherein the second peak hold detector is configured to generate a lower peak signal from the output voltage signal or the signal based on the output voltage signal;
• an evaluation device, wherein the evaluation device is configured to form a difference from the generated upper peak signal and the generated lower peak signal, to compare the formed difference or a quantity based on the formed difference with an adjustable threshold value, and to determine the On state of the drive motor when the threshold value is reached or exceeded;
• and
• a communication interface, wherein the communication interface is configured to send the determined On state and/or operating data based on the On state wirelessly to a terminal.