航天器热试验加热电缆绝缘自动测试系统的设计

为实现航天器热试验外热流模拟装置与航天器之间绝缘性能的检测,对加热电缆绝缘自动测试技术进行研究,设计了一套基于PXI的航天器热试验加热电缆绝缘自动测试系统.该系统采用继电器矩阵技术设计了加热电缆输入通道切换装置,基于PXI总线仪器实现了多芯电缆自动扫描以及对地绝缘电阻的测量,并采用VC++ 6.0开发了系统上位软件.测试结果表明,该系统能够在短时间内完成最多8根加热电缆的对地绝缘检测,结果准确、运行可靠,大大提高了加热电缆绝缘电阻测试的自动化水平.

Design of cable insulation automatic test system used in spacecraft thermal test

In order to detect the insulating property between the spacecraft thermal test external heat flux simulator and spacecraft,the heating cable insulation resistance automatic test technology is studied.a heating cable insulation resistance test system based on PXI bus is developed.The input channel switch device of heat cable is designed through relay matrix technology,the cable multiple core channel scanning and the insulation resistance measurement is reached through PXI bus technology,ant the control software is developed through VC++6.0.The test result shows that the system can detect the insulation fault of eight heating cables quickly and reliably,and greatly improve the automatic level of spacecraft thermal test.