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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如图2 - 2所示，输入偏置电流(IBIAS)在源电阻(RS)上产生了误差电压。

As shown in Figure 2-2, the input bias current (IBIAS) develops an error voltage across the source resistance (RS).

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如果不进行“调零”修正，所产生的偏置量就会叠加到输入信号上产生误差。

Unless it's corrected by "zeroing," the resulting offset produces an error by adding to the input signal.

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