Application of  highspeed digitizer of PCI9846 in electrical discharge characteristic measurement

GE Huimin，CHEN  Jiwei， LI Meizhen， CAI Jiongjiong
(College of Electrical and Electronic Engineering，Zhejiang Institute of Mechanical &
Electrical Engineering， Hangzhou 310053，China）

Abstract： Aiming at the electrical discharging characteristic with discharging gap，a measurement system was firstly constructed by using the 4CH high speed digitizer of ADLINK PCI9846 Then the method for measuring the electrical discharging characteristic with discharging gap was discussed， and the voltage waveforms and current waveforms between the two ends of the gap were measured After the analysis of voltage waveforms and current waveforms， their characteristics for the machining states of zero load， normal electrical discharge， transient arc discharge， and short circuit were all acquired The results  indicate that the range of threshold voltage in the different machining states is different and associated with the current，then the range of threshold voltage must be corrected dynamically by the supply voltage， discharging current and workpiece material，which provides effective data for servo controller optimization
Key words： highspeed digitizer of PCI9846；wire cut electrical discharge machining（WEDM）； electrical discharge characteristic measurement