心电图机的原理及结构（The principle and structure of electrocardiograph）.doc

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心电图机的原理及结构（The principle and structure of electrocardiograph）.doc

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心电图机的原理及结构（The principle and structure of electrocardiograph）

心电图机的原理及结构（The principle and structure of electrocardiograph） ECG machine Structure and principle The 1 input circuit is composed of electrode plate, lead wire, lead selection switch and high frequency filter circuit. Effects: reduce interference, select leads, and signal each part of the human body to the preamplifier. The 1. 1.1 lead wire acts as an input to the amplifier at the input of the ECG signal on the electrode board. It is a five core (or multicore) stranded wire with a metal shield. The line is soft and the joint is firm. Shielding network is to prevent the interference of electromagnetic waves. Shield network often grounding, lead wire often has five core, seven core and thirteen core three kinds. The 1. 1.2 lead selector switch does not change the electrode line of the human body, and is used to change the connection method between the lead wire and the ECG amplifier, and is used to record a lead electrocardiogram. There are three kinds of switches: round band switch, keyboard switch and touch switch. 1., 1.3 high frequency filter circuit is to filter unnecessary high-frequency signal, reduce high-frequency interference. Generally consists of RC low-pass filter circuit. 1.2 ECG amplifier circuit, which is the core of ECG, is to amplify the ECG signal to promote the work of the recorder, which consists of preamplifier circuit, voltage amplifier circuit and power amplifier circuit. 1., 2.1 preamplifier circuit is to change the heart of the slow change of Telecommunications The number is amplified enough to drive the voltage amplification circuit, while there is enough to suppress all kinds of dry Ability to disturb signals. It mainly includes preamplifier and 1mV calibration generator Constant, circuit, etc. 1., 2.2 voltage amplifier circuit is to amplify and output preamplifier, only The 20mV ECG signal is further amplified and transmitted to the post amplifier. It consists of direct current Voltage amplifier, gain regulating circuit, base line regulati