中频处理器的功能与指标

在射频收发系统中,往往可以注意到中频处理器的存在。然而在测试测量中经常遇到非常类似的仪器或模块, 如示波器、数字化仪。它们都是高速数据采集设备,但是由于其功用不同,它们的品质指标也不一样。本文讲述各种模 块的应用功能和品质指标,及中频处理器和示波器、数字化仪的关系。     

利用面向对象的软件工程定制仪器

本文通过一个车载数据记录仪案例,讲解如何运用面向对象的软件工程方法定制仪器。并且讲解了该方法通过 基于对象的建模和流程管理,建立较完善文档、积累技术价值、降低人员依赖、减小软件缺陷损失。本文是利用电子工 程结合计算机科学的方法在仪器仪表研制方面的创新探讨。     

物联网应用驱动RFID应用测试

Directional response is one of the most important parameters of pyranometer, which is crucial to evaluate the performance of the pyranometer by determining the responsivity and the corresponding radiation for solar beam radiation from different directions of the pyranometer. In the paper, the method for testing directional error is present, four pyranometers are tested, after data processing, the directional errors of a secondary standard CMP22 and a first class CMP11 are 4.5 W/m2 and 8.3 W/m2 respectively, which are within the nominal specification given by the manufacturer. Meanwhile, the directional error of a first class pyranometer FS-S6 is 11.0 W/m2, while the value of a second class pyranometer TBQ-2-B is 15.2 W/m2, which both meet the specification for classification. The results show that these four pyranometers can reach the levels recommended by WMO and ISO, which validates that the method is feasible and the China made pyranometers are reliable.