To configure the NI 9944/9945, create a global virtual channel within MAX by selecting Analog Signals » Analog Input » Strain. Select the NI 9237 module and appropriate channel, and name the task. Now you can configure the task using the window shown below.
Note that if you hold your mouse cursor over the Strain Configuration field, MAX will display the circuit diagram (seen below) in MAX's bottom right help window.
In the case above, R4 is the strain gauge, and R3 is the completion resistor provided by the NI 9944/9945. All circuitry, with the exception of the strain gauge (R4), is internal.To access the connection diagram click on the Connection Diagram tab at the bottom of the window. Make the physical connections illustrated in the diagram.When setting up a strain task, you might consider calibrating the strain gauge. You can do this by returning to the Configuration window by clicking on the NI-DAQmx Global Channel tab at the bottom of the page. Here you can select the Device tab under Strain Settings.Now click on the Strain Calibration button. The window seen below will appear.Note: When performing shunt calibration, the NI 9237 contains a built in shunt resistor, which the NI 9944/9945 internally hard wires across R3. You will therefore want to select R3 as the Location.
For more details about each calibration type and instructions on completing the calibration, click on the Help button at the bottom.
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