VIRTUAL SIMULATION EXPERIMENT BASED ON LABVIEW: MEASURING LOW RESISTANCE WITH DOUBLE-ARM BRIDGE

In response to the problems of limited experimental equipment, low accuracy, and complex data processing for measuring resistance with DC (direct current) double-arm bridge in current university physics experiments, a virtual simulation experimental platform for measuring low resistance with double-arm bridge has been successfully constructed using LabVIEW. The experiment used a research method of controlling variables to study the effect of changing parameters such as the material, cross-sectional area, and length of the resistance rod on the resistance value. By drawing corresponding images, the resistivity of different materials can be obtained. The full function of measuring resistance with a dual arm bridge has been achieved, which can meet the majority of experimental needs. The simulation program can accurately measure resistance in the range of 10^-7Ω by selecting appropriate ratio arms. Multiple simulation data results have shown that this virtual experiment can accurately measure the resistance value of low resistance, with errors kept below 0.020%, and has high accuracy. In college physics experiment courses, using virtual instruments for experimental teaching effectively improves the quality of teaching, while also freeing oneself from the constraints of experimental locations and environments, making experiments more convenient and helpful for previewing and reviewing.