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标准灵敏度是心电图机的一项重要指标,指在仪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1mV标准信号源用于校准整机的放大器增益,诊断患者心电图时都是以此为依据的。大部分国产心电图机标准信号源采用1.35V锌汞标准电池,开始使用时,输出电流小定标电压准确;日久电池电压下降,反映在描笔上的定标
Standard sensitivity is an important indicator of the ECG machine, referring to the preamplifier stage input 1mV voltage, the pen to produce 10m / m amplitude. This 1mV standard signal source is used to calibrate the amplifier gain of the whole machine, based on which the patient’s ECG is diagnosed. Most of the standard domestic electrocardiogram signal source using 1.35V standard zinc-mercury battery, start using, the output current is small calibration voltage accuracy; long battery voltage drops, reflected in the pen on the calibration