Design of cable conduction and cable sequence test system based on LabVIEW platform using sound card

Based on the sound card as the signal source and acquisition module, the signal source is guided to each link of the line sequence to be determined through the multi-channel relay, The sound card is used to collect the signal and analyze the frequency and amplitude to determine the continuity and sequence of the link, It includes the setting of signal output type, output frequency, sampling length, sampling number and channel number, and the realization of corresponding control program, The software of the system is written with LabVIEW and the hardware transfer circuit, And serial port signal switching module and other hardware, can display the signal source waveform in real time, display the collected signal waveform and the determined line sequence and conduction results. The results show that: The system design is a consistent, stable, fast and high accuracy solution for line sequence or continuity test requirements including capacitance and capacitance like devices, The system has good expansibility, especially for the number of lines between a bundle, the more efficient the system can be reflected. After actual production verification, the overall accuracy of the system is more than 99.9%.