虽然输入偏置电流是这种误差的常见来源，但是外电路产生的电流在源电阻上形成的电压降也能引起误差。

Although input bias current is a common source of this type of error, currents generated by external circuits can also result in errors due to voltage drops across the source resistance.

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对外电路而言，在基波频率下有源滤波器被控制为无限大阻抗，在谐波频率下被控制为小电阻。

The active filter acts as an infinite impedance to the external for the fundamental frequency and as a low resistor for harmonic frequencies.

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外电路由串联电阻、电感和并联电容组成。

The external circuit consists of resistance connected in series with inductance and capacitance connected in parallel with them.

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