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对某型导弹引信混频晶体2CV_3反向电流测试原理的分析表明,大量2CV_3晶体反向击穿是由外来干扰信号所造成的,而外来干扰信号之所以能影响混频晶体,是由于4B-J引信测试台的三根测试电缆中所有屏蔽线的屏蔽网套没有与其相应插头(座)的1号接点(即机壳)相连接,造成测试时屏蔽网套不接地,屏蔽不起作用,各导线之间电信号相互干扰严重.外来干扰信号具有随机性,因而比较复杂.但是,只要引信测试台及其测试电缆中所有屏蔽线的屏蔽网套接地可靠,就可以避免2CV_3混频晶体大量反向击穿.最后,还提出了三项具体预防措施.
The analysis of 2CV_3 reverse current test principle for a certain type of missile fuze mixed crystal shows that the reverse breakdown of a large number of 2CV_3 crystals is caused by the external interference signal and the external interference signal can affect the mixed crystal because the 4B- J fuze test bench three test cable shielding shielded wire sets of all shields not connected with its corresponding plug (Block) No. 1 contacts (that is, the case) connected to the test caused when the shield is not grounded, the shield does not work, each However, as long as the shielding nets of all shielded wires in the test bench of fuze and its test cables are grounded reliably, it is possible to avoid a large number of anti-interference of 2CV_3 mixed crystals Breakdown Finally, three specific precautionary measures are also proposed.