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。
After the bandwidth and temperature, the remaining factor in determining the system noise is the effective source resistance.
讨论了带宽和温度以后，决定系统噪声的另一个因素就是等效源电阻。
The effective resistance is the parallel combination of the source resistance and the feedback (or shunt) sensing resistance.
有效电阻为源电阻和反馈(或分流)取样电阻的并联组合。
Table 2-3 summarizes minimum recommended source resistance values for various measurement ranges for a typical feedback ammeter.
表2-3给出了典型的反馈安培计在各种测量范围内最小的源电阻推荐值。
Johnson noise may be reduced by lowering the temperature of the source resistance and by decreasing the bandwidth of the measurement.
降低源电阻的温度、减小测量的带宽可以降低约翰逊噪声。
Noise can seriously affect sensitive current measurements. This section discusses how source resistance and source capacitance affect noise performance.
噪声能够严重地影响灵敏的电流测量工作。本节讨论源电阻和源电容如何影响噪声的性能。
The previous equations suggest several means for reducing Johnson noise. It might be possible to reduce the bandwidth, the source temperature, or the source resistance.
上述公式给出了降低约翰逊噪声的几种方法，即可以减小带宽、降低源的温度或者降低源电阻。
The source resistance of the DUT will affect the noise performance of a feedback ammeter. As the source resistance is reduced, the noise gain of the ammeter will increase.
DUT的源电阻会影响反馈安培计的噪声性能。源电阻降低，安培计的噪声增益就增加。
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。
An additional advantage of this connection is that input resistance approaches infinity as the capacitor C1 approaches full charge, eliminating errors due to loading of the source resistance.
上面这个电路的另一个优点在于，当电容c1充电完毕后，输入电阻将趋于无穷大，因此可以消除因信号源内阻产生的误差。
An additional advantage of this connection is that input resistance approaches infinity as the capacitor C1 approaches full charge, eliminating errors due to loading of the source resistance.
上面这个电路的另一个优点在于，当电容c1充电完毕后，输入电阻将趋于无穷大，因此可以消除因信号源内阻产生的误差。
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