[方波图](%E6%96%B9%E6%B3%A2%E5%9B%BE.md) [工具提示](%E5%B7%A5%E5%85%B7%E6%8F%90%E7%A4%BA.md) [示波器](%E7%A4%BA%E6%B3%A2%E5%99%A8.md)