Metrological methods for virtual instrument

Because of the particularity in structure, virtual instrument has put forward new requirement to the metrology of traditional instrument. With the analysis of the difference between virtual instrument and traditional instrument, this paper get hold of the evaluating parameters of the characteristic of virtual instrument and the method to ascertain the precision of them. Then according to the strategy of entire metrological test some arguments such as correction of metrological errors, metrological standards, measurement methods and automatic metrological methods of virtual instrument are discussed.