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We appreciate your patience as we improve our online experience.
07-17-2014 08:12 AM
To plot force vs. strain, acquire an array of each, then bundle the two one-dimensional arrays together and wire that cluster to an XY Graph. That should give you the plot you're looking for.
Here are some links from the online help:
http://zone.ni.com/reference/en-XX/help/371361K-01/lvconcepts/types_of_graphs_and_charts/#XY_Graphs
http://zone.ni.com/reference/en-XX/help/371361K-01/lvhowto/graphing_xy_data/
07-17-2014 12:43 PM
Hi James,
Thank you for the Info, Can you provide me with a sample VI??. I am kinda new to labview.
07-18-2014 09:18 AM
Here's a good community example,
https://decibel.ni.com/content/docs/DOC-18312
but instead of the sine and sinc functions, you would feed your acquired data in.
07-18-2014 02:39 PM
Thanks Jim,
Can i give inputs from DAQ Assistants ( one for force and the other for strain ) instead of sine and sinc functions.
07-19-2014 02:57 PM
07-28-2014 04:46 PM
Hi Carlos,
I have a question. I used a half bridge strain gauge circuit to get the strain values. Is the graph generated in labview giving you the total strain reading of both the strain gauges or the strain reading of a single strain gauge. If it is giving the total strain values, then how to get the strain values of the individual strain gauges.
Thank you
07-29-2014 08:32 AM
Are your strain gauges set up in Half-Bridge configuration I, II, or III? These different options are documented very well here: http://www.ni.com/white-paper/4172/en/
Also documented in that white paper is how strain(e) is calculated from the measured voltages.
07-29-2014 10:51 AM
it is half bridge type II.. but the graph is showing only one signal. is it giving me the strain reading of both the strain gauges?. the value is 2x10^-6. is it the strain of one strain gauge or addition of both ( 3x10^-6 + 3*10^-6 )
07-29-2014 11:20 AM
07-29-2014 12:33 PM
The returned value will be the strain (e). It is using information from both gauges to calculate the strain on the object they are connected to. It is calculated by the equation in the white paper attached above.