Based on the analysis of the working principle of the circuit,we focused on the impact analysis of AD8638 de-vice performance,simulated switch leakage,residual flux,internal water vapor,film-forming substrate,and pin insulation on the problems of zero bias and linearity anomalies discovered during high-temperature testing of I/F conversion circuits,fi-nally,clarified that the fault phenomenon was caused by the deposition of insulation resistance on the surface coating of the insulator at high temperature.The surface of relevant pins glass insulators of faulty circuit occurred coating accumulation,and the insulation performance of the coating decreased at high temperature,which was the reason of causing circuit zero bi-as and linearity anomalies,and the insulation resistance measured values were identical with theoretical calculating values at high temperature test conditions.When the temperature continued to rise,the solvent molecules began to volatilize from the coatings,and the insulation performance and insulation resistance of the coating increased gradually until the circuit parame-ters returned to normal.By conducting experimental research on the influence of 823 coating on electrical parameters,the inherent mechanism of circuit failure was obtained,and product disposal measures and subsequent improvement measures were determined.
关键词
零偏和线性度异常/高温测试/823涂层/玻璃绝缘子/绝缘电阻/机理分析
Key words
zero bias and linearity abnormity/high temperature testing/823 coating/glass insulators/insulation resist-ance/mechanism analysis
维普
万方数据