Hi, I understand that you are connecting several analog input signals in both NRSE and Differential mode to your PCI-6014. The best source for information on connecting and scanning these signals is the user manual. In the 6014's user manual, there is a section that outlines Analog Input and how to connect analog signals. (pg. 4-6). If you do not have the user manual, you can access it at ni.com/manuals. There is also a helpful document on the NI Developer Zone entitled Field Wiring and Noise Considerations for Analog Signals. These resources will be able to fully answer your questions, but I can offer a few tidbits of information to answer your specific questions and get you on your way.
1. Connecting AISENSE to AIGND in NRSE mode Whether you should connect AISENSE to AIGND through a resistor depends on whether or not your signal source is grounded or floating. If it is floating, then you should connect AISENSE to AIGND through a bias resistor. If your signal source is grounded, then you do not need to connect AISENSE to AIGND. 2. How to set up Differential Signals. In differential mode, the AI channels are paired, with ACH<i> as the signal input and ACH<i+8> as the signal reference. For example, ACH0 is paired with ACH8, ACH1 is paired with ACH9, and so on. If your signal source is floating, then you will have to run the ACH<i+8> input to AIGND through a resistor. 3. How to scan from differential channels. There are several clocking signals provided on the board, and they can be used for sampling and triggering. You can sample from the signals in a variety of methods depending on what software interface you are using. Thanks for contacting National Instruments, and I hope that this helps you connect your board! Marcus G. National Instruments
