In the SCB-68 shielded junction box, the DC signal source is connected to the contacts through a current limiting resistor. The analog I/O port of the PXI-6229 collects the signals at both ends of the contact to determine the open/close state of the contact. At the same time, the displacement signal of the laser sensor is collected to measure the movement of the contact holder and the upper core. The contactor will be pulled/released 19 times in the range of 0° to 180° throughout the test. In the process of using the automatic test system, due to the complicated electromagnetic environment of the test room, it will have certain influence on the system. Therefore, many anti-electromagnetic interference measures have been added, including the SCB-68 shielded junction box and SHC68-68-EP shielded wire. Cables (connecting data acquisition cards and SCB-68 junction boxes) and differential signal connections. At the same time, a software filtering algorithm was written to eliminate the glitch of the displacement signal and received good results. The test end software adopts oscilloscope style and is responsible for instrument control and data acquisition. The analysis end software adopts Windows system style and contains accurate and efficient contactor test algorithm, which is responsible for data processing and analysis. The original data is saved by using TDMS file, and the calculation result is exported to Excel.TDMS file. The data collected under each phase angle is saved as a group, and each group contains several contact action signals, laser displacement signals and phase angle trigger signals. . To make it easier for users to get started, the software provides a lot of help, including scrolling tips under the software and detailed help files that pop up when the mouse is over the control. In order to track the usage of the device, the software will be connected to the Access database when the software is started. After logging in, the user will record the user, the time period of use, the device status and usage comments, etc., to facilitate the management of the device status and the future software upgrade. Improve.
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