Why does DAQMx ask about Poisson's Ratio when configuring AI Strain channels?

[kent.wedeking]

Why does the DAQMx Create Virtual channel Method for creating an AI Strain channel ask about the Poisson's ratio of my measurement?  Is DAQMx/LabVIEW using this value for any of its calculations?  All I want is strain.  My customer is concerned because he's never had to specify this before, using Signal Express and MAX.  Thanks!

[LindyHop]

Hello kent.wedeking,

The Poisson ratio should be set for the material to be measured in order to assure proper readings. LabVIEW defaults to .3 (Steel) 

http://www.ni.com/white-paper/3642/en/

http://zone.ni.com/reference/en-XX/help/371361K-01/lvmeasapps/meas_strain/