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介绍了锤击法小应变信号桩基动测仪的原理，针对动态验桩特点，利用数模转换板的电阻网络构成运算放大器，提出了一个具有反馈回路的程控增益电路，下位机采用ＳＴＤ总线结构，硬件模块化设计，软硬件共同构成可使验桩具有手控和自动程控增益功能；上位机软件采用开放式结构，可挂接不同的小应变法动测验桩分析处理软件包。
The principle of the hammer-based small-strain signal pile-foundation dynamic tester was introduced. According to the characteristics of dynamic inspection, the resistance network of digital-to-analog conversion board was used to construct the operational amplifier. A program-controlled gain circuit with feedback loop was proposed. The lower computer adopts STD bus. The structure, the hardware modular design, and the combination of software and hardware make the inspection piles hand-controlled and automatic program-controlled gain functions; the host computer software adopts an open structure and can be connected to different small-strain method dynamic testing piles to analyze and process software packages.