A component comprising a main module and an extension module connected together, wherein the extension module is an extension module configured for independently storing calibration data and comprises: a first interface, adapted to receive a first external input signal; a second interface, adapted to output a first output signal of the extension module; a signal processing circuit, connected between the first interface and the second interface; and a first memory, the first memory storing first calibration data, wherein the first calibration data being associated with the extension module and wherein the first calibration data comprises at least a gain of the extension module and an offset of the extension module and wherein the main module comprises: a third interface, adapted to be butted with the second interface of the extension module; a second memory, the second memory storing second calibration data, wherein the second calibration data is associated with the main module and wherein the second calibration data comprises at least a gain of the main module and an offset of the main module; and a controller, wherein the controller is configured for: reading the first calibration data stored in the first memory on the extension module when the component is powered on; reading the second calibration data stored in the second memory on the main module; combining the first calibration data and the second calibration data to form third calibration data; and storing the third calibration data on the main module as calibration data of the component. wherein the extension module is an extension module configured for independently storing calibration data and comprises: a first interface, adapted to receive a first external input signal; a second interface, adapted to output a first output signal of the extension module; a signal processing circuit, connected between the first interface and the second interface; and a first memory, the first memory storing first calibration data, wherein the first calibration data being associated with the extension module and wherein the first calibration data comprises at least a gain of the extension module and an offset of the extension module and a first interface, adapted to receive a first external input signal; a second interface, adapted to output a first output signal of the extension module; a signal processing circuit, connected between the first interface and the second interface; and a first memory, the first memory storing first calibration data, wherein the first calibration data being associated with the extension module and wherein the first calibration data comprises at least a gain of the extension module and an offset of the extension module and wherein the main module comprises: a third interface, adapted to be butted with the second interface of the extension module; a second memory, the second memory storing second calibration data, wherein the second calibration data is associated with the main module and wherein the second calibration data comprises at least a gain of the main module and an offset of the main module; and a controller, wherein the controller is configured for: reading the first calibration data stored in the first memory on the extension module when the component is powered on; reading the second calibration data stored in the second memory on the main module; combining the first calibration data and the second calibration data to form third calibration data; and storing the third calibration data on the main module as calibration data of the component. a third interface, adapted to be butted with the second interface of the extension module; a second memory, the second memory storing second calibration data, wherein the second calibration data is associated with the main module and wherein the second calibration data comprises at least a gain of the main module and an offset of the main module; and a controller, wherein the controller is configured for: reading the first calibration data stored in the first memory on the extension module when the component is powered on; reading the second calibration data stored in the second memory on the main module; combining the first calibration data and the second calibration data to form third calibration data; and storing the third calibration data on the main module as calibration data of the component. reading the first calibration data stored in the first memory on the extension module when the component is powered on; reading the second calibration data stored in the second memory on the main module; combining the first calibration data and the second calibration data to form third calibration data; and storing the third calibration data on the main module as calibration data of the component.