Research on Abnormal Temperature Sensor Data in Field Verification Based on PSpice
In response to the abnormal phenomenon that the measured values of the temperature sensors and standard devices generally rose by about 0.5℃～1.0℃above the set value in the field verification,PSpice software was used to draw simulation circuit to compare the difference of grounding potential between series single point grounding and parallel single point grounding.The mathematical model was established by using uncertainty theory.The sources of uncertainty were point out which infect the measurement results.Each component of uncertainty and its proportion of the total uncertainty were calculated.The results show that,the extended uncertainty introduced by the verification device was 0.15℃.After carrying out uncertainty analysis to exclude the influence of measuring devices,it is con-cluded that the interference of ground loop has an impact on the data,with an impact degree of up to 47%.
field verificationground loopmeteorologicaluncertainty
NETL
NSTL
万方数据
