安捷伦PNA编程帮助手册，该文件为.chm格式，比PDF格式好看多了；如果打开什么文字都没显示，那么需要右击文件“属性”，‘解锁’就可以了。-Agilent PNA programming help manual, the .chm file format, more attractive than the PDF format　if not open any text display, you need to right-click on the file " Properties" , ' unlock'　on it.