online examina- tion of experimental operation，virtual simulation experiment of measuring

electromotive force with eleven-wire po- tentiometer is designed and developed on LabVIEW

platform，which can fully simulate all functions of the actual in- strument. The operating steps and

experimental precision of the virtual simulation experiment software are consistent with those of

the experimental instrument used in our school. Meanwhile，the virtual instrument is also

equipped with operational tips and instructions，which can help students preview and review the

experimental principles and process on the computer. The packaged software can be completely

detached from the programming platform and be used on other computers without the need for

pre-installed software. The experimental principle，the design method of the virtual instrument

and the selection basis of the parameters are described in detail，and the programming

block diagram of the system is provided.