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 ACHi as the
signal input and ACHi+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 ACHi+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
