示波器扫描与触发方式的选择

正确选择示波器的扫描和触发方式，是进行电子测试和获得正确数据的前提，也是示波器应用的难点。示波器常用连续和触发两种扫描方式，通过对其原理的介绍和对脉冲信号测试的对比分析，揭示两种方式不同的测试特征。触发扫描有常态、自动和单次三种触发方式，通过对其工作机制的探讨，结合实际应用的经验，得出基于不同测试信号和测试目的的触发方式选择方法，以解决示波器应用和教学中的难点问题。

Selection of the Scanning and Trigger Mode of Oscilloscope

To choose the scanning and trigger mode of oscilloscope,is the premise to test an electronic signal and obtain the correct data, is also its application difficulty. There are two kinds of scanning mode： continuous scanning and trigger scanning. By introducing the principle of the two modes and analyzing the example of pulse signal testing using the different modes comparatively, reveals the dif- ferent testing characteristics. There are three modes for trigger scanning： Norm, Auto and Single. By discussing their operating principle,combining with practical application experiences,it concludes how to choice the correct trigger modes based on different test signals and different test purposes. The method indicated that it is useful to solve the question of application and teaching difficulty to oscillo- scope.