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在检修心电图机时,都要检查一下各个导联波形是否正常,修好后对该心电图机的各个技术指标要进行测量,其中检查共模抑制比(CMRR)和1毫伏定标电压时,要从心电图机导联线输入专用测试信号,一般修理人员没有这种测试仪器,给修理和调试带来不少困难.本文介绍一种制作方便的多功能模拟心电信号发生器,它的线路简单,功能较全,可以模仿人体RA、LA、LL、CH和RL点的心电波形,用以检查心电图机的导联线和导联开关;可以输出1毫伏标准电压,用以检查心电图机的1毫伏定标电压是否准确;可以输出1.5伏的共模信号,用以测量心电图机的CMRR.它是维修和使用医用电子仪器的一种有效工具.
In the repair of ECG machine, we must check the various lead waveform is normal, after repair of the ECG machine to measure the various technical indicators, which check the common mode rejection ratio (CMRR) and 1 millivolt calibration voltage, the need to ECG signal from the ECG dedicated test signal input, the general repair staff do not have such test equipment, to repair and debug a lot of difficulties.This article describes a convenient production of multi-function analog ECG generator, and its circuit is simple , Full-featured, can simulate the human RA, LA, LL, CH and RL point ECG waveform to check the ECG lead and lead switch; can output 1 millivolt standard voltage to check the electrocardiograph Of the 1 millivolt calibration voltage is accurate and can output a common-mode signal of 1.5 volts to measure the CMRR of an electrocardiograph It is an effective tool for the repair and use of medical electronics.