本文第一章首先介绍了继电保护测试仪的原理以及历史和现状，然后提出本系统的设计方案和本课题的任务。
In chapter one, it introduces the theory, history and actuality of relay protection testing devices first, then proposes the scheme of this system and the task of this research.
第五章阐述了应变信号处理模块的设计与应变仪的抗干扰设计。
Fifth chapter elaborates the design of strain signal processing module and strain gauge's antijamming design.
第三章介绍高速误码率测试仪发端子系统的设计方案；
The third chapter discusses transmitter' s de-sign scheme of high speed BERT.
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