It is important to note that the numbering of the Wheatstone bridge arms is not arbitrary. The resistor values are used in complex equations to calculate the strain or expected voltage. The resistor name definition can be summarized as follows:
Below we illustrate not only the external connections necessary to take measurements from various types of strain gages, but also the external connections needed for shunt calibration.The NI-9237 has 10 pins for each channel. These pins correspond to:
We can see the NI-9237’s internal bridge completion resistors. EX+ , EX-, and AI+ will still need to be connected by the user.
Quarter Bridge II configuration is connected to the NI-9237 as if it were a Half Bridge. R4 is the active quarter bridge strain gage. R3 is a dummy resistor placed perpendicular to the direction of strain, and will therefore exhibit changes in resistance only due to temperature drift. When configuring the strain measurement task in software, you will need to select Quarter Bridge II in the task set up.Quarter Bridge:
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