传统示波器在浮地测量中的应用限制及解决方案

Application constraints and solutions of traditional oscilloscope to measure the floating grand system

车载、机载、箭载等电子装备最多采用的是浮地接法,虽然浮地接法有很多优点。但在设备的生产测试中示波器的使用存在一些问题,传统示波器的地与工频电源共地,用该示波器测试浮地设备时,有可能对电子设备造成损伤。分别采用传统示波器与浮地示波器测试某箭载浮地接法的模数转换电路的锯齿波。实验证明:传统接地示波器有可能造成CMOS电路的闩锁故障。最后提出结论浮地设备应优先选用浮地示波器测试,以及对传统示波器的改进措施。

Car,airplane,rocket and other electronic equipment is using the floating connection.The floating grounding method has many advantages.But using oscilloscope to test the equipment have a few problems.The traditional oscilloscope with industrial frequency power,using it to test the floating equipment,possible damage to electronics.Adopts the traditional oscilloscope and floating oscilloscope test some onboard floating connection method of analog-digital conversion circuit of a sawtooth wave.Experiments prove that the traditional grounding oscilloscope has the potential to cause CMOS circuit latch fault.Finally,the conclusion of floating ground equipments should be preferably used in floating oscilloscope test,as well as the traditional oscilloscope improvement measures.