The meter input resistance should be much higher than the source resistance.

仪表的输入电阻应当远远大于源的内阻才能满足对测量准确度的要求。

The fundamental limit to measurement is Johnson noise in the source resistance.

对测量的基本限制是源电阻中的约翰逊噪声。

The effective source resistance includes the device under test as well as the measurement instrument.

电阻包括被测设备和测量仪器两个方面。

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

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。

For example, if the desired accuracy is 1%, then the meter resistance must be more than 100 times the source resistance.

例如，如果希望的准确度为1%，那么表的输入电阻必须比源的电阻高100倍。