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故障现象1胎心率数值显示正常,胎心率记录曲线偏低很多.初步检查开机按下自校开关,胎心率数值显示为150,而胎心率记录笔仅处于120线上.因此认为故障在三号板或四号板上.电路分析从三号板输出的胎心信号(或自校信号)和从记录器上反馈回来的信号经过加法器相加,去控制正反转功放电路,再由功放电路控制胎心记录器的工作.因此三号板送出的胎心信号
Symptom 1 The fetal heart rate value is displayed normally, and the fetal heart rate recording curve is much lower. The initial examination of the boot presses the self-check switch, the fetal heart rate value is displayed as 150, and the fetal heart rate pen is only on line 120. Therefore, The fault is on the third or fourth board. Circuit analysis The fetal heart signal (or self-calibration signal) output from the third board and the signal fed back from the recorder are added by the adder to control the positive and negative power amplifier circuit. , and then by the amplifier circuit to control the work of the fetal heart recorder. Therefore, the fetal heart signal sent by the third board