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故障现象:一台ND-161型十六道脑电图机,开机后打定标电压,十六道输出均正常,但置Ⅰ、Ⅱ、Ⅲ、Ⅳ档时,部分道有干扰,干扰时轻时重。分析检修:定标输出正常,说明定标电路、前级放大电路以后的电路无故障。可能的故障原因有:导联与病人接触不良、导联断路或插头插座接触不良、导联选择电路有问题。观察Ⅰ、Ⅱ、Ⅲ、Ⅳ导输出波形,发现有干扰的通路都与10号输入线有关。用万用表测量导联→分线盒→与机内相连的插
Symptom: A ND-161 type 16-channel electroencephalograph machine, after the start of the calibration voltage, 16 output are normal, but when I, II, III, IV files, some road interference, interference Light weight. Analysis and maintenance: The calibration output is normal, indicating that the circuit after the calibration circuit and the pre-amplification circuit has no fault. Possible causes of failure include poor contact between the lead and the patient, disconnection of the leads or poor contact of the plug and socket, and problems with the lead selection circuit. Observe the output waveforms of I, II, III, and IV and find that the disturbed paths are related to the input line No. 10. Using a multimeter to measure lead → distributor box → plug connected to the unit