NI6221 carries the data of voltage unsteady when a temperature controller is working. I used the differential input module. The temperature controller's name was 518P which was producted by the Yudian Automation Technology Co. When only the NI 6221 card carried the data of voltage, the wave of voltage in the LABview was well. But when the NI 6221 card and temperature controller worked together, the wave of voltage carried by card was not steady. what,s the matter?
Give me some advance
cheng_bei
