自动平衡记录仪中通常采用滑线电阻作为位置反馈元件。使用过程中滑线电阻与触点之间的磨损、沾污等造成接触不良,成为影响仪表可靠性的主要因素。尽管设计制造时在选择滑线电阻的材料,结构和接触方式等方面作过不少努力,终究不能彻底解决问题。日本横河北辰产的3507型携带式自动平衡记录仪中,采用超声波位置变换器代替传统的滑线电阻,成 Sliding resistors are commonly used as position feedback components in autobalance recorders. In the process of using the sliding resistance between the contacts and contact wear, dirt, etc. caused by poor contact, become the main factor affecting the reliability of the instrument. Although many efforts have been made in the selection of materials, structures, and contact methods for the slick resistors in the design and manufacture, the problems can not be completely solved after all. Japan’s Hebei Hengbei 3507 portable automatic balance recorder, the use of ultrasonic position transducer instead of the traditional slip resistance, into