作　　者： ; ; ; (王欢）;

机构地区： 吉林师范大学信息技术学院

出　　处： 《电子测量技术》 2007年第5期182-184,共3页

摘　　要： 汽车仪表在出厂前要进行必要的测试来验证仪表的质量是否达标,此时测试台需要产生模拟汽车工作的频率信号和电阻信号来驱动仪表。对于频率信号用单片机系统产生比较容易,而产生可变的电阻信号所用的方法却大部分采用继电器连接固定电阻的方式来实现,这样当测试的仪表型号改变时就必须根据需要重新连接的新电阻,这种方法不仅在使用上比较麻烦而且不能保证阻值的精度。本文叙述了一种基于单片机程序控制的可变电阻技术,可以在实际应用中解决模拟一定范围内电阻信号的问题。文中介绍了该设计的原理,并对其技术性能进行了详细的分析。 The automobile measuring appliance must be carried on the essential test before saling to confirm whether the quality can attain the designated standard. The test panel needs to simulate the automobile work frequency signals and the resistance signals to actuate the measuring appliance. For production the frequency signals, employing the single chip micyoco system （SCM） is a quite easy way. However, adopting the relay connection fixed resistance way to produce the invariable resistance signals is a troublesome method because new resistances must be reconnected according to actual needs when measuring appliance model is changed. A new lechnology of employing SCM procedure to control the variable resistors is proposed, which can solve the simulation resistance signals problem in the certain scope in the practical application. In the paper, the design principle is introduced, and the technical performance is analysed in detail.

关 键 词： 受控源 差分放大器 转换

领　　域： [电气工程]