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针对非标准测试环境下开展电子设备EMI预先测试的特点,研究了几种典型电磁干扰测试项对信号采集和处理的需求,提出了多功能便携式虚拟测试仪的技术思路,并利用LabVIEW虚拟仪器开发环境实现了高效灵活的数据采集及其与Matlab编程环境的接口。实验结果证明,该方法将LabVIEW和信号处理算法的优点得以充分结合,不仅对消除背景噪声有明显的效果,也降低了电子设备EMI测试的成本,具有良好的扩展性、集成性和实用性。
Aiming at the characteristics of pre-testing electronic equipment EMI in non-standard test environment, the need for signal acquisition and processing of several typical electromagnetic interference test items is studied. The technical idea of multi-function portable virtual tester is put forward. With LabVIEW virtual instrument development Environment to achieve efficient and flexible data acquisition and its interface with Matlab programming environment. The experimental results show that this method can fully combine the advantages of LabVIEW and signal processing algorithms, which not only has obvious effect on eliminating background noise but also reduces the cost of EMI testing of electronic equipment, and has good expansibility, integration and practicability.