The principle of operation of a successive approximation type direct displacement to digital converter for a floating-wiper resistive potentiometric sensor, presented earlier, is analyzed in detail to ascertain possible sources of error that can affect the performance of the transducer. Based on the analysis the method is suitably modified to improve its performance. To establish the efficacy of the altered scheme, a prototype signal conditioning circuit has been built and tested using both an emulated sensor and a prototype sensor. While the worst-case error in the former was found to be 0.5%, it was less than 0.8% in the latter. The test results indicate that the digital output is directly proportional to the per-unit displacement and is independent of the value of the coupling capacitance between the floating-wiper and the resistive element.

详细分析了浮子电阻式电位计传感器的逐次逼近型直接位移至数字转换器的工作原理，以确定可能影响传感器性能的误差源。根据分析，可以对该方法进行适当修改以提高其性能。为了确定变更方案的有效性，已经构建了原型信号调理电路，并使用仿真传感器和原型传感器进行了测试。虽然发现前者的最坏情况误差为0.5％，但后者的误差小于0.8％。测试结果表明，数字输出与单位位移成正比，并且与浮动刮水器和电阻元件之间的耦合电容值无关。