对测量的基本限制是源电阻中的约翰逊噪声。
The fundamental limit to measurement is Johnson noise in the source resistance.
有效电阻为源电阻和反馈(或分流)取样电阻的并联组合。
The effective resistance is the parallel combination of the source resistance and the feedback (or shunt) sensing resistance.
降低源电阻的温度、减小测量的带宽可以降低约翰逊噪声。
Johnson noise may be reduced by lowering the temperature of the source resistance and by decreasing the bandwidth of the measurement.
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