The virtual instrument is a new instrument after simulation

digital and intelligentized instrument.It is a new orientation in electronic measurement area.The virtual instrument is an advanced technique of electronic measurement and computer measure and control.With computers being introduced into electronic measurement area

digital and software technology enhance the flexibility and expansibility of measurement system.The evolution of testing instrument is reviewed.The definition of the virtual instrument and its characteristics is narrated.The software structure and hardware structure of the virtual instrument is studied.At last the prospects of the bright future is emphasised.