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一、短路法心电图机常会产生描笔抖动,波形干扰、基线漂移以及热笔偏向一边等故障,运用短路法可以较快确定故障范围。首先利用机器面板上“准备·观察·记录”开关判断故障是在整机的前面部分,还是在后半部分,如开关处在“短路”(“准备”挡)位置时,故障消失,则故障发生在前几级,反之则在后几级。当然这并不排除机内稳压电源的故障。然后,将开关打开,利用短路法把各级输出讯号短路(即将电子管的二个屏级或晶体管的二个集电极短路),观察故障是否存
First, short-circuit ECG machines often produce pen jitter, waveform interference, baseline drift, and hot-skipped one-sided faults. Using the short-circuit method can quickly determine the fault range. First, use the “Ready, Observe, and Record” switch on the machine panel to determine whether the fault is in the front or rear half of the unit. If the switch is in the “short circuit” (“prepare” gear) position, the fault disappears. Occurs in the first few levels, and vice versa. Of course, this does not rule out the failure of the internal power supply. Then, turn on the switch, short-circuit the output signals of all levels (that is, short-circuit the two electrodes of the electron tube or the two collectors of the transistor), and observe whether the fault exists.