Current measurement device and method

A current measurement device, comprising a broadband current measurement probe, a quantum current measurement probe, and a first control circuit, the first control circuit being connected to the broadband current measurement probe, the quantum current measurement probe comprising a magnetic core, a coil provided on the magnetic core, and a quantum current measurement member provided in an air gap of the magnetic core, the first control circuit being further connected to the coil and the quantum current measurement member respectively;

• wherein
• the broadband current measurement probe is configured to perform a current measurement on a to-be-measured conductor and obtain a broadband current signal;
• the first control circuit is configured to determine a coil current value and a regulation microwave frequency according to the broadband current signal, circulate a coil current into the coil according to the coil current value, and control a microwave frequency at which the quantum current measurement member operates according to the regulation microwave frequency;
• the quantum current measurement member is configured to perform a current measurement on the to-be-measured conductor and obtain a measured current value, wherein a magnetic field direction of a first magnetic field generated by the measured current at the air gap during the current measurement is opposite to a magnetic field direction of a second magnetic field generated by the coil current at the air gap.