反应测试仪的原理及设计

Principle and Designing of Reaction Tester

本文以设计一个成本低,能测试人的反应(响应)时间的仪器为目标,提出了系统设计方案.以8255为并行接口芯片进行硬件设计;以8253芯片的计时功能所计的时间与0FFFFH的差值作为反应时间;以8253芯片的分频功能实现了反应时间精确到百分之一秒;以八段数码管作为显示时间的设备,通过汇编语言设计了相应的测试反应时间的软件.测试结果表明,反应测试仪的测量精度较高,能达到百分之一秒.

The author puts forward a system scheme to design a instrument for testing people＇ s reaction time by lower cost. This paper has designed the corresponding software to test the reaction time through the assembly language. The hardware derigning is taken with by 8255 parallel interface chip. The reaction time is devermined by the time difference of time function of 8253 chips anb OFFFFH. The precisim of centisecond is achived with the 8253 frequency sub - chip functions. The test results show that the design of the reaction tester has higher precision.