Another consideration when measuring voltages from high resistance sources is the input bias current of the voltmeter.
在测量高电阻源时要考虑的另一个问题是电压表的输入偏置电流。
2
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.
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。
3
As shown in Figure 2-2, the input bias current (IBIAS) develops an error voltage across the source resistance (RS).