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心电图机的标准灵敏度是一项重要指标;指的是在机器的前置放大级输入1mV电压时,使描笔产生10m/m的振幅。这个1mA的标准信号源是校准整机的放大器增益,诊断患者心电图时,都是以这个标准信号源为依据的。我国生产的大部分心电图机标准信号源采用1V水银电池1.35V锌汞标准电池。开始使用时,输出电流小定标电压准确;使用日久电池电压就会下降,反映在描笔上的定标波振幅就不再是10m/m。例如标准电池原是1.35V的电压,现降为
The standard sensitivity of an electrocardiograph is an important indicator; it means that when the 1mV voltage is applied to the preamplifier stage of the machine, the stylus generates an amplitude of 10m / m. This 1mA standard signal source is to calibrate the amplifier gain of the whole machine. When diagnosing the patient’s ECG, it is based on this standard signal source. Most of the standard electrocardiogram machine source produced in China adopts 1V mercury battery 1.35V zinc-mercury standard battery. When starting to use, the output current is small and the calibration voltage is accurate; when the battery voltage is long, the voltage of the battery will drop. The amplitude of the calibration wave reflected on the stylus is no longer 10m / m. For example, the standard battery voltage is 1.35V, is reduced to