Electric circuit for monitoring isolation resistance measurement within the high voltage, HV, board net of an electronic vehicle, comprising: a HV power system providing a positive high voltage potential (HV+) and a negative high voltage potential (HV-), wherein a common ground potential (GND/Chassis) is defined in the middle between a positive isolation resistance (R IsoP) and a negative isolation resistance (R IsoN), the positive isolation resistance (R IsoP) and the negative isolation resistance (R IsoN) being connected in series and parallel to the HV power system between the positive high voltage potential (HV+) and the negative high voltage potential (HV-); a positive measurement resistance (R 0_p) connected in parallel to the positive isolation resistance (R IsoP) between the positive high voltage potential (HV+) and the ground potential (GND/Chassis); a negative measurement resistance (R 0_n) connected in parallel to the negative isolation resistance (R IsoN) between the negative high voltage potential (HV-) and the ground potential (GND/Chassis); a positive voltage meter (U BAT_P) between the positive high voltage potential (HV+) and the ground potential (GND/Chassis); a negative voltage meter (U BAT_N) between the negative high voltage potential (HV-) and the ground potential (GND/Chassis); characterized in that the electric circuit further comprises only a single amperemeter (I iso_p or I iso_n) permanently configured to measure either a positive current I iso_p through the positive measurement resistance (R 0_p) between the positive high voltage potential (HV+) and the ground potential (GND/Chassis), or a negative current I iso _ n through the negative measurement resistance (R 0_n) between the negative high voltage potential (HV-) and the ground potential (GND/Chassis). a HV power system providing a positive high voltage potential (HV+) and a negative high voltage potential (HV-), wherein a common ground potential (GND/Chassis) is defined in the middle between a positive isolation resistance (R IsoP) and a negative isolation resistance (R IsoN), the positive isolation resistance (R IsoP) and the negative isolation resistance (R IsoN) being connected in series and parallel to the HV power system between the positive high voltage potential (HV+) and the negative high voltage potential (HV-); a positive measurement resistance (R 0_p) connected in parallel to the positive isolation resistance (R IsoP) between the positive high voltage potential (HV+) and the ground potential (GND/Chassis); a negative measurement resistance (R 0_n) connected in parallel to the negative isolation resistance (R IsoN) between the negative high voltage potential (HV-) and the ground potential (GND/Chassis); a positive voltage meter (U BAT_P) between the positive high voltage potential (HV+) and the ground potential (GND/Chassis); a negative voltage meter (U BAT_N) between the negative high voltage potential (HV-) and the ground potential (GND/Chassis); characterized in that the electric circuit further comprises only a single amperemeter (I iso_p or I iso_n) permanently configured to measure either a positive current I iso_p through the positive measurement resistance (R 0_p) between the positive high voltage potential (HV+) and the ground potential (GND/Chassis), or a negative current I iso _ n through the negative measurement resistance (R 0_n) between the negative high voltage potential (HV-) and the ground potential (GND/Chassis).