NI-DAQ 6008USB: any trick to use PGA also for RSE inputs?

[rossi]

I'm using a NI-6008.

The sensor that I'm using, give me 0..1.5V in output and it's powered by
+5V of the 6008 so it share the same GND with 6008:

+5V
[SENSOR] -----out----> >--AI0
| >--GND
--- GND

In this scenario, must I configure input as RSE input?
(DAQmx_Val_RSE in NI-DAQmx) or I can configure input as differential
input (DAQmx_Val_Diff in NI-DAQmx)?

But, so doing, I can't use PGA to achieve full scale, since Gain=1 when
RSE inputs are used.

Is there any trick to force use of PGA also with RSE inputs?

Thanks in advance

[Chris_Rake]

If you are using 4 AI channels or less and you're using the same ground all around, you can operate in differential mode and ground the - terminal and connect your measurement to the + terminal.  This will allow for the use of the internal amplifier which will give you a higher effective resolution.