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一、信号源对系统精度的影响采集装置中采样器的漏电流、放大器的失调电流、失调电压,它们通过信号源内阻会产生零点偏移.系统的高输入阻抗又会接受各种噪声.信号源内阻越大,噪声和漂移也越大.信号源内阻的不同形式及阻值对系统的串模干扰和共模干扰的影响不同,信号源内阻越大,干扰越大.同样内阻时,双端平衡式信号源比单端形式的串模、共模的抑制率高.
First, the source of the impact on the accuracy of the system Acquisition device sampler leakage current, amplifier offset current, offset voltage, they pass the signal source internal resistance will have zero offset system high input impedance will accept a variety of noise signal The greater the internal resistance, the greater the noise and drift.The different forms and resistances of the internal resistance of the signal source have different effects on the series-mode interference and the common-mode interference of the system, and the larger the internal resistance of the signal source, the greater the interference. Double-ended balanced signal source than the single-ended form of the serial mode, high rejection rate of the common mode.