INPUT CURRENT MEASUREMENT SYSTEM

PROBLEM TO BE SOLVED: To provide an improved measurement system capable of accurately measuring current of a capacitive sensor for measuring distance.SOLUTION: The measurement system for measuring an input electrical current Ics from a current source 71 and generating a current measurement signal, comprises a current measuring circuit 70 having a first input terminal 72 connected to the current source and an output terminal 74 for providing the current measurement signal. The current measuring circuit 70 further comprises one or a plurality of power supply terminals 75, 76 configured to receive one or a plurality of voltages from power supplies 77a, 77b for powering the current measuring circuit. The current measuring circuit 70 also comprises a first voltage source VD coupled to the one or the plurality of power supply terminals, the first voltage source providing a disturbance voltage to the one or the plurality of power supply terminals, the disturbance voltage representing a voltage at the first input terminal 72.SELECTED DRAWING: Figure 13 【課題】距離を測定するための容量センサの電流を正確に測定できる改善された測定システムを提供する。【解決手段】電流源７１からの入力電流Ｉｃｓを測定し、電流測定信号を生成するために、電流源に接続された第１の入力端子７２と、電流測定信号を供給するための出力端子７４とを有する電流測定回路７０を備え、電流測定回路７０は、電流測定回路に電力供給するための電源７７ａ、７７ｂから１つまたは複数の電圧を受け取るように構成された１つまたは複数の電源端子７５、７６をさらに備える。電流測定回路７０はまた、１つまたは複数の電源端子に結合された第１の電圧源ＶＤを備え、１つまたは複数の電源端子に外乱電圧を供給し、外乱電圧は第１の入力端子７２における電圧を表す。【選択図】図１３