Differential mode and CB68LP board

Hi:
I have a question on differential mode on CB68LP board. Attached is a diagram of op am with a differential stage circuit digram. I got from the link here.
http://zone.ni.com/devzone/conceptd.nsf/webmain/D59654FA44D2F9FA86256F4A006064F3?opendocument#4
As you see. The gound of Vs looks the same as RL ground. As I see the ground of RL. It is a AIGND. Am I see the way correct? If not, please verify me?
That is the first thing.
The second thing is I have a test fixtuer. The attached block digram at the bottom which show current meter is the output to put a resistor across AI+ and AI- in CB68LP board to measure voltage.
You also see the test fixture ground after the current meter. I use the DMM to test the AIGND and the test fixture ground. They are not connected. But how come the first diagram, Vs ground looks like the same ground as RL. Could you explain to me? I don't understand here. Also, I would like to ask if the current go through AI+ to AI- and then from AI- to back to the ground of the test fixture.
Could you please verify me here.
At last,if I have a case where AI- is at the AIGND (the same wire), I don't have to put bias resistor. why do I not afraid of removing common voltage and common noise? Could you pls explain?
Many thank if you can replay to me promply. I am in an urgent.
Regards,
John
Attachments:
Block diagram of the fixture.pdf ‏43 KB
Op amp.jpg ‏49 KB

Hi:
Is there anyone that can answer my question? I have been waiting for three days. I am in a very urgent. Thanks!
Regards,
John

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