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现将热笔式心电图机几个主要技术指标简易测法介绍如下: 一、走纸速度:要求0.04秒走纸1毫米,误差小于±2％,速度均匀。测法(一):用秒表间隔10秒钟打出两个定标电压方波,走纸应为250毫米,误差应小于±5毫米。测法(二):观察市电(50赫)产生的干扰波。在25个小方格内应有50个干扰波而且疏密均匀。二、增益(放大倍数):正常增益应为5000～7500倍。测法:灵敏度(增益)旋钮置于适中位置时,1毫伏定标电压抽出10毫米高的方波;将旋钮调至最大时,描出20毫
Now hot pen-type electrocardiogram several simple technical indicators described as follows: First, the paper speed: 0.04 seconds required to take paper 1 mm, the error is less than ± 2%, uniform speed. Method (a): with a stopwatch interval of 10 seconds shot two square wave voltage scale, paper should be 250 mm, the error should be less than ± 5 mm. Method (B): observe the city power (50 Hz) generated by the interference wave. In 25 small squares should have 50 interference waves and density evenly. Second, the gain (magnification): The normal gain should be 5000 to 7500 times. Method: Sensitivity (gain) knob placed in the right position, 1 millivolts calibration voltage out of 10 mm square wave; the knob to the maximum, the profile of 20 milliseconds