| The development of GPATS (general proposal automatic test system) can reduce the development cost effectively and lower the dependence of appointed instrument. Signal oriented test system has conspicuous effect on the generality of ATS (automatic test system), and can solve the reusability of TPS and the interchangeability of instrument to a great extent. Therefore, building up a good test signal model has important significance for carrying out the GPATS.Based on forenamed background, a thorough research on the classification and models of the testing signal was made in this paper. By the introduction of IEEE1641 (signal and the test definition) standard layer structure, this paper emphatically analyzes the reuse and extension mechanism of signal, the XML interface description of signal model and the ability of signal dynamic control. Although 1641 standard has great advantages of signal reuse and extension, there is still a gap to its commercial application, such as the shortage of digital signals handling, the ambiguity of the dynamic signal model definition and etc. Combining the STD and aiming at the above problem, this paper consummates a classification and modeling scheme on testing signals, which divides them into basic signals and compound signals. Also, the twice transfer idea of compound signals was put forward. That is modeling signals based on the compound signals two times, which are achieved in the way of module calling.On the basis of the modeling scheme above, a visual design of signal model is achieved with the usage of COM, through which the properties of the signals' interface might be setted on the interactive GUI. In addition, users can stimulate the signal models graphically and adjust the visual parameters in order to make waveform meet the requirements. The feasibility of this modeling scheme, the scalability and reusability of the signal library and the portability of the signal output model have been validated in many testing cases. |
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