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Excitation NI 9237

The NI 9237 Strain gage module measures strain or mV/V, i need mV/V because i measure and calculate  6 component balances with matrices with a mV/V input and the calculation results in a X-,Y- and Z-force and a X,Y and Z Moment.
Because i'm an hardware engineer and i worked already 25 years in data acquisition systems. The sensing of the ni 9237 is completely strange to me.
I understand that the the returned excitation voltage is not correcting the excitation voltage.
Can you tell me how it is used, is it measured to calculate the mV/V or is it correcting the input amplifier to give the corrected mV/V output to the ADC.
It is possible to give a (block)schematic of the unit. That is wat i'm missing about this module!
Even with a strain indication calibrator i find the measured strain very unstable!
 
 
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I advise you to have a look to the help on line in MAX : there's an complete explanation about the measure of strain gage.
Wilfried.
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