Abstract
The loading automatic test system for measurement of power line filters are in urgent demand. So the software sub-system of the whole test system was proposed. Methods: structured the test system based on the virtual instrument framework, which consisted of lower and up computer and adopted the top down approach of design to perform the system and its modules, according to the measurement principle of the test system. Results: The software sub-system including human machine interface, data analysis and process software, expert system, communication software, control software in lower computer, etc. had been designed. Furthermore, it had been integrated into the entire test system. Conclusion: This sub-system provided a fiendly software platform for the whole test system, and had many advantages such as strong functions, high performances, low prices. It not only raises the test efficiency of EMI filters, but also renders some creativities.
Highlights
Power line filter plays an important role in each electrical and electric system for suppressing the EMI(Electromagnetic Interference) in order to meet the requirements of EMC(ElectroMagnetic Compatibility) Certification standards
GB7343-1987[1] rules the methods of measurement of suppression characteristics of passive radio interference filters and suppression components over the frequency range of 10khz to 30Mhz, and MIL-STD-220B[2] stipulates the methods for insertion loss (IL) testing when filter is under full loading, while CISPR 17[3-4] fixes the approximate worst case impedance IL testing beyond the standard test method which uses a calibrated 50 Ω signal source and a 50 Ω receiver
This paper addresses the software design in an actual automatic test system for main specifications stated above especially the loading IL automatically testing for the filter
Summary
Power line filter plays an important role in each electrical and electric system for suppressing the EMI(Electromagnetic Interference) in order to meet the requirements of EMC(ElectroMagnetic Compatibility) Certification standards. The aims of software design in the test system are to overcome the shortcomings of traditional manually testing and provide some advanced features and performances for the whole system and the test program It sets up a friendly software platform to implement whole automatic specification test for each filter when it has been installed into the homemade test box which plays an important role in the testing configuration. It performs an automatically test procedure according to the turns of index for DUT. It realizes some intelligent function such as provides some redesign propositions for those unqualified DUT
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