典型气候试验对热敏电阻电性能参数影响研究

Study on the Influence of Typical Climate Test on the Electrical Performance Parameters of Thermistor

热敏电阻作为一种基础电气元器件,在电气集成系统中被广泛使用。经验表明,其电性能参数易受气候试验的影响。本文研究了五种典型气候试验对热敏电阻电性能参数的影响。试验项目包括高温试验、低温试验、快速温变试验、温度循环试验、盐雾试验。同时,研究了两种典型试验序列对其电参数的影响。研究发现,温度循环对热敏电阻标称零功率的影响较小,偏差在5%以内;高温和低温试验对其有一定影响,偏差在10%以内;盐雾和快速温变测试对其有较大影响,偏差大于20%。另外,试验序列2的严酷度远高于序列1的严酷度,对样品产生更大的破坏性。盐雾试验可能会影响样品内部污染等级情况,快速温变试验具有较大的严酷度,其通常应在其他环境试验完成后进行。本文的研究将为标准的制修订,测试工程师的方案合理制定提供一定的参考。

As a basic electrical component,thermistor is widely used in electrical integrated systems.Experience shows that its electrical performance parameters are easily affected by climatic tests.The effects of five typical climatic tests on the electrical performance parameters of thermistors are studied in this paper.The test items include high temperature test,low temperature test,rapid temperature change test,temperature cycle test and salt spray test.At the same time,the effects of two typical test sequences on its electrical parameters were studied.It is found that the temperature cycle has little influence on the nominal zero power of thermistor,and the deviation is less than 5%.High temperature and low temperature test have some influence on it,the deviation is less than 10%;Salt spray and rapid temperature change test have great influence on it,the deviation is greater than 20%.In addition,the harshness of test sequence 2 is much higher than that of sequence 1,resulting in greater damage to the sample.The salt spray test may affect the internal contamination level of the sample,and the rapid temperature change test has a greater severity and should usually be carried out after the completion of other environmental tests.The research of this paper will provide some reference for the revision of standards and the formulation of test engineers’schemes.