心电图机的检定，是由一函数信号发生器通过有关人体参数模拟电路和导联选择网络（三者组成心脑电图机检定仪），产生检定所需要的标准幅度信号和频率信号，由被检心电图机记录描记。其测量不确定度的评定主要从电压幅度（定标电压）和信号频率（走纸速度）两个方面分别进行。 ECG test, is a function of the signal generator through the human body parameters of the analog circuit and the lead selection network (the three components of the heart electroencephalograph tester) to produce the required calibration of the standard amplitude and frequency signals from Check electrocardiograph record. The measurement uncertainty of the assessment mainly from the voltage amplitude (calibration voltage) and signal frequency (paper speed), respectively, two aspects.