Research On Relay Test Technology Based On Virtual Instrument

This article comprehensive analysis relay test technology's present situation, has researched relay test technology based on the virtual instrument. Elaborated the cause that time parameter produces when the relay coil when power on and off, the cause that contact resistance change produces when contact of relay closing and disconnecting, the cause that operation value and the release value produce. As well as the purpose and significance of the relay time parameter, the contact resistance, the coil current, the operation value and the release value makes the dynamic testing.Elaborated realizes the overall project design to relay's test technology, including testing basis, the definition of testing parameters and testing methods. Introduced the relay main parameter testing principle and the method, namely the relay time parameter which, the contact resistance, the coil current, the operation value and the release value test principle and the method defines in the relay testing standards, defined the testing principle and the method and the method to the testing standards in realizes has carried on the elaboration, and introduced the operation value and the release value test often used several kind of test algorithms, and unified several algorithms the merits to obtain the final algorithm to apply in the system. Elaborated relay main test function realization, for can satisfy many kinds of relay many kinds of models the tests, introduced one kind based on a three-terminal regulator LM317 the 0—48 V DC voltage source might the program control voltage source design, introduce might the program control voltage source principle of design and the method, and carries on the test and the analysis under the different load current condition to this power source; Also introduced entire testing system main component's choice and this testing system's testing software, to this part of tests when testing software when design meets the question solution has carried on illustrating.According to tested the principle and the method gives the standard the testing circuit to carry on the practical application, to the relay time parameter, the contact resistance and the coil current has carried on the dynamic test and the curve which between changed as necessary these three parameters demonstrated, as well as carried on the test to the relay operation value and the release value, the operation value and the release value digital quantity which tested demonstrates.This article has made the preliminary discussion to the relay testing technology, assigned the test circuit to the test standard to carry on the practical application, has obtained the corresponding curve and the data.