According to the measurement

control and signal processing requirements of chemical machinery and equipment

and taking two PCs connected with Ethernet as hardware platform

a multi-function virtual signal spectrum analyzer was developed using virtual instrument graphical development software package LabVIEW as software development tool.The arbitrary signal generator virtual instrument (VI) module was developed on a PC

and the spectrum analyzer VI module was designed on the other.The arbitrary signal generator VI module could generate two channels waveform signal with additive white noise.On the other hand

the spectrum analyzer VI module collected the waveform signal adding with noise generated by the arbitrary signal generator VI module through Ethernet

and carried out low pass filtering

window smoothing processing

amplitude spectrum and phase spectrum analyzing to the waveform signal.The test results on chemical machinery monitoring of a pilot plant showed that the virtual signal spectrum analyzer had good performance.