心电图机受干扰的解决方法

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                    <p><span style=""><img src="http://weituibao.qiniudn.com/img/editor/guide/5.gif" data-ratio="0.11857707509881422" data-w="" style=""  /></span></p><p><span style="">在心电图机走纸记录时，心电图上叠加有一定幅度和有规律的正弦波或叠加一种无规律的毛刺，即为干扰。分为以下几种</span><br style=""  /><span style=""><img data-s="300,640" src="http://mmbiz.qpic.cn/mmbiz/A1DicCH9Vl6NmgDIcNNicOKkMxzicKUYicU8KlDSCWLzia6qPMkzYhGovAjbnib3icOhceKdyaHOf0vdq5EBXkKf4ZedA/0" data-ratio="0.9189723320158103" data-w=""  />工作时有干扰</span><br style=""  /><span style="">导联线断、隐断或漏电均可引起干扰。但一般因导联线断，引起的干扰表现为只有在相关导联状态时才会引入干扰。最简单也最彻底的办法是更换导联线，但如果有修复价值的最好从断处或漏电处剪开后，再重新焊接。导联开关接触不良、接线断线、脱焊等均会引入干扰。记录器或热笔线圈与机壳接触也可能引入干扰。</span><br style=""  /><span style="">导联开关置“0”位时有干扰</span><br style=""  /><span style="">首先，判断干扰是50?Hz还是低频。如果是50?Hz干扰一般为导联输入部分有断线、脱焊现象，即导联线断线；导联开关到放大板的输入线插头座断脚、脱焊或接线断。如果表现为低频干扰，则首先检查电刷上刷毛是否齐整；是否与不该接触处有电气接触，然后，再检查电机线圈是否有断线。</span><br style=""  /><span style="">阻尼不正</span><br style=""  /><span style="">(1)描1mV定标电压波形时，波形无上冲且有圆角即为阻尼过大。排除方法：调整阻尼调节电位器使阻尼适中。</span><br style=""  /><span style="">(2)描1mV定标电压波形时波形上冲过大，即为阻尼过小。排除方法：</span><br style=""  /><span style="">调整阻尼调节电位器使阻尼适中。若阻尼过小且不可调整时，先检查阻尼调节电位器是否脱焊，损坏或接触不良。如果损坏则应予更换。如未损坏，则故障为记录失磁造成，应更换记录器或重新上磁。</span><br style=""  /><span style="">基线漂移</span><br style=""  /><span style="">导联开关在“0”位时，记录器描绘的基线不水平而有缓慢上升或下降，即为基线漂移。</span><br style=""  /><span style="">排除方法：用酒精擦拭放大板上各插头、插座，以防有漏电现象。待完全干燥后，观察基线漂移是否仍然过大。随后检查前置放大器与电压放大器之间耦合电容是否漏电。然后，再检查封闭继电器电路。用线路分割法，断开封闭继电器电路，如漂移达到标准要求，则故障为封闭继电器损坏或漏电，应更换。最后，检查场效应管。先用替代法，以同型号场效应管分别替换前级场效应管。如故障消除则前级中某一只场效应管(或两只)输入电阻不稳，应更换。</span><br style=""  /><span style="">但必须用两只各项参数</span><span style="">均比较接近的场效应管将原来两只都换下，否则，若场效应管不对称，对心电图机其他指标将有很大影响。如漂移仍然过大。一般为后级场效应管某只输入电阻不稳定，同法替换即可。</span><br style=""  /><span style="">其他干扰</span><br style=""  /><span style="">电源纹波过大、滤波电容损坏，内部应该接地处未接好，内部走线不合理或屏蔽不良等都可引入干扰。</span></p><p style="white-space: normal;"><img src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0" data-ratio="0.14784394250513347" data-w="487"  /></p><p style=""><br style="max-width: 100%; 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