Current-measuring device, especially for determining the motor current of a direct-current motor
 Current-measuring device including a non-contacting current sensor and an evaluating device connected downstream to the sensor for producing an output signal proportional to a current being measured, comprising a circuit arrangement for determining a zero drift of at least one of the evaluating device and the current sensor from symmetrical components of the current being measured and for correcting the drift. 
Heidelberger Druckmaschinen AG
G G
G01R G01R
inventional inventional
Helmut Bertold
Meyer Grutzmacher