探究桥臂电阻及待测电阻的阻值改变对惠斯通电桥相对不确定度的影响

摘要

Based on principle of Wheatstone bridge,the bridge arm resistance and the resistance change of the resistance under test for the influence of the relative uncertainty of Wheatstone bridge of exploration,obtained under the condition of the bridge arm ratio of 1 1,with the increase of bridge arm resistance and the relative uncertainty of changes. Measure of the relative uncertainty of the resistance under test and the change of the bridge arm resistance curve trend has nothing to do with the resistance under test,but different resistance under test in the same bridge arm resistance measured under the condition of different relative uncertainty.%基于惠斯通电桥原理，进行桥臂电阻及待测电阻的阻值改变对惠斯通电桥相对不确定度的影响的探究，得出了在桥臂比为1：1的情况下，随着桥臂电阻的增大，相对不确定度也会随之变化。测得的待测电阻的相对不确定度与桥臂电阻的变化曲线趋势与待测电阻无关，但不同的待测电阻在相同的桥臂电阻的情况下测得的相对不确定度不同。