How do I configure analog input channels

[bradle95]

I am having problems configuring analog input channels. I need to be able to read multiple analog inputs at the same time. When I run the test panels in MAX, all the physical channels work correctly. However when I run my program, no matter whan channel I have a vi set to, it reads the same data. For example, if I have two vi's reading analog input channels 2 and 5, and I supply 3volts to channel 2... the indicators for channel 2 and channel 5 read 3volts, and likewise if I supply 3 vots to channel 5, both channel 2 and 5 indicators read 3volts. How can I set up my program so that each indicator only shows it's input?

[RIO-Todd]

Hello bradle95,

It's possible that you are seeing ghosting. I would suggest to ground any analog input channels that you don't have anything connected to. If you don't have anything connected to a channel, the channel will be floating and other channels could be ghosted onto the unconnected, floating channels. If you short the channels to AIGND that you aren't connecting to, this should eliminate this problem. Check out the document linked below.

Data Acquisition: Troubleshooting Unexpected Voltages or Cross-talk in Analog Input Channels
http://digital.ni.com/public.nsf/websearch/B9BCDFD960C06B9186256A37007490CD?OpenDocument

I hope this helps. Let me know if you have any additional questions.

Regards,

Todd D.
NI Applications Engineer