A current sensor system comprising: a plurality of current sensors (104a-104n), each configured to be positioned, in use, proximate to a respective one of a plurality of conductors (106a-106n) configured to carry a current to be measured and spaced from one or more other ones of the plurality of current sensors (104a-104n), each current sensor (104a-104n) comprising one or more magnetic field sensing elements configured to generate a respective magnetic field signal indicative of a detected magnetic field, wherein the number of current sensors (104a-104n) in said plurality of current sensors (104a-104n) is equal to the number of conductors (106a-106n) in said plurality of conductors (106a-106n); and a controller coupled to receive the magnetic field signal from each of the plurality of current sensors (104a-104n) and, for each current sensor (104a-104n), configured to characterize a magnetic coupling between the current sensor (104a-104n) and each of the plurality of conductors (106a-106n) by generating a coupling matrix comprising an intended coupling factor indicative of a magnetic coupling between the current sensor (104a-104n) and the respective one of the plurality of conductors (106a-106n) and one or more parasitic coupling factors indicative of a magnetic coupling between the respective one of the plurality of conductors (106a-106n) and the other ones of the plurality of current sensors (104a-104n), wherein generating the coupling matrix comprises providing a predetermined level of a reference current to the respective conductor (106a-106n) during a characterizing time when normal operational current is not carried by the respective conductor (106a-106n) and measuring an output signal of the respective current sensor (104a-104n) and each of the other ones of the plurality of current sensors (104a-104n). a plurality of current sensors (104a-104n), each configured to be positioned, in use, proximate to a respective one of a plurality of conductors (106a-106n) configured to carry a current to be measured and spaced from one or more other ones of the plurality of current sensors (104a-104n), each current sensor (104a-104n) comprising one or more magnetic field sensing elements configured to generate a respective magnetic field signal indicative of a detected magnetic field, wherein the number of current sensors (104a-104n) in said plurality of current sensors (104a-104n) is equal to the number of conductors (106a-106n) in said plurality of conductors (106a-106n); and a controller coupled to receive the magnetic field signal from each of the plurality of current sensors (104a-104n) and, for each current sensor (104a-104n), configured to characterize a magnetic coupling between the current sensor (104a-104n) and each of the plurality of conductors (106a-106n) by generating a coupling matrix comprising an intended coupling factor indicative of a magnetic coupling between the current sensor (104a-104n) and the respective one of the plurality of conductors (106a-106n) and one or more parasitic coupling factors indicative of a magnetic coupling between the respective one of the plurality of conductors (106a-106n) and the other ones of the plurality of current sensors (104a-104n), wherein generating the coupling matrix comprises providing a predetermined level of a reference current to the respective conductor (106a-106n) during a characterizing time when normal operational current is not carried by the respective conductor (106a-106n) and measuring an output signal of the respective current sensor (104a-104n) and each of the other ones of the plurality of current sensors (104a-104n).