Hello Serg1987--
National Instruments offers great resources for getting started with Data Acquistion. I have some of them linked throughout my reply.
Since your first statement was that you needed some guidance with Measurement & Automation Exploer, have you seen this article?
NI Developer Zone Tutorial: Getting Started with NI-DAQmx: Measurement & Automation Explorer (MAX) F...
On this page there are particular Developer Zone tutorials with videos that discuss the creation/configuration of channels and tasks in Measurement & Automation Explorer.
NI Developer Zone Tutorial: Creating a Virtual Channel in NI-DAQmx and using it in LabVIEW
NI Developer Zone Tutorial: Creating a Task in NI-DAQmx and Using it in LabVIEW
Once you have made your task for your data acquisition, you need to focus on making the correct connections. Depending on the type of terminal configuration you choose while configuring your channel or task (more on this later), this can change how you should wire-up to your DAQ device. Measurement & Automation Explorer has an excellent resource to help make sure you are making the appropriate connections.
NI Developer Zone Tutorial: Using Connection Diagrams for NI-DAQmx Tasks
Another great resource when making your connections is the Device Pinouts for your particular DAQ.
NI Developer Zone Tutorial: NI-DAQmx Device Pinouts
I noticed that you are interested in measuring data between CHN0+ and AGND and between CHN0- and AGND. When you are configuring the terminal configuration in your NI-DAQmx task, refer to the connection diagram tutorial I linked above because it will indicate the pins you should be connecting to. If you would like to know when and why to use Differential, RSE, or NRSE--you guessed it, there's another great tutorial on this.
NI Developer Zone Tutorial: Field Wiring and Noise Considerations for Analog Signals
I hope this is helpful! Cheers!!
