Current measurement device for current-carrying cable, especially for motor vehicle, has voltage supply device that generates floating operating voltage at internal d.c. voltage output connected to measurement and evaluation device

摘要

The measurement device has positive and negative connections (7,8) to the corresponding sides (9,10) of the cable (6) connected together via a measurement resistance (11) so that current in the cable passes through the resistance, a measurement and evaluation device (12) that providers current signals correlated to the measurement current to at least one external interface (18) and a voltage supply device (13) with a d.c. voltage input (14) connected to a voltage source whose voltage is greater or less than the required operating voltage, whereby the voltage supply device generates the operating voltage and provides it in floating form at an internal d.c. voltage output (15) connected to the measurement and evaluation device.