Hi ahad, The best way to move forward is to identify which module in your system is causing the problems. What I would do is: 1) Check to make sure it is not your DAQ card. You can do this by applying the 5V reference from the card to channel 0 and make sure when you test channel 0 in Measurement & Automation Explorer you read 5V. To measure the value, you can use the Test Panels for your device. 2) You can also run the online E Series Diagnostic Utility to determine if you have a problem. It requires NI-DAQ 6.9 or higher and Internet Explorer 5.0 or higher. Here is the link: http://www.ni.com/support/selftest/default.htm 3) If your DAQ board passes those tests, then it is not the DAQ board. The next thing to check is that your cable and pins are not the problem. You can use a multimeter to check for continuity on the cable. 4) Move the channels you were measuring from channels 0-3 to channels that were working correctly. If you notice that the problem follows the move then it is morelikely your circuit or device that you are testing. If the trouble is still on channels 0-3 then it could be the AMUX-64T. 5) Check the wiring to the AMUX-64T to make sure no wires are loose. It could be that those paths internal to the device have been damaged. What I would do is put a battery or some known voltage source on one of the channels and scan through all the channels to see if you can still see that signal. If you can't then, the board might have been damaged. If that is the case, then you will have to request a repair on the board (ni.com/ask).
Anyway, hope that helps. Have a good day. Ron Applications Engineering National Instruments
