对测量的基本限制是源电阻中的约翰逊噪声。
The fundamental limit to measurement is Johnson noise in the source resistance.
在2.6.5节中对约翰逊噪声进行更详细的讨论。
降低源电阻的温度、减小测量的带宽可以降低约翰逊噪声。
Johnson noise may be reduced by lowering the temperature of the source resistance and by decreasing the bandwidth of the measurement.
这种电荷的运动产生了噪声，通常称为约翰逊噪声或热噪声。
This charge movement results in noise, which is often called Johnson or thermal noise.
所有的电压源都具有内阻，所以所有的电压源都会产生约翰逊噪声。
All voltage sources have internal resistance, so all voltage sources develop Johnson noise.
约翰逊噪声给出了可以达到的电压或电流测量分辨率的理论极限值。
Johnson noise imposes a theoretical limit to achievable voltage or current resolution.
在电子测量中分辨率的最终极限是由约翰逊噪声或者热噪声来决定的。
The ultimate limit of resolution in an electrical measurement is defined by Johnson or thermal noise.
所有真实的电压源和电流源都具有内阻，所以它们都表现出约翰逊噪声。
All real voltage and current sources contain an internal resistance; therefore, they exhibit Johnson noise.
噪声源能够产生很大的误差，噪声的来源包括约翰逊噪声、磁场和地回路等噪声。
Significant errors can be generated by noise sources, which include Johnson noise, magnetic fields, and ground loops.
约翰逊噪声在很宽的频率范围内呈均匀分布，所以减小噪声带宽能够有效地降低测量中的噪声。
Johnson noise is uniformly distributed over a wide frequency range, so reducing the noise bandwidth effectively decreases the noise in the measurement.
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 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 previous equations suggest several means for reducing Johnson noise. It might be possible to reduce the bandwidth, the source temperature, or the source resistance.
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