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      Point-to-Point Calibration with live values

      How to Perform a Point-to-point Calibration with Live Values using a Q.series Controller

      Purpose

      This guide describes how to adjust/calibrate a channel's input readings using the sensor's live input values.

      Procedure (GI.bench)

      1. Click Read to load connected DAQ system's configuration into project window (or open existing project that matches configuration to connected hardware)
      2. Switch to the Data acquisition tab to start acquisition
      3. Either right-click > Edit variable from the data acquisition or configuration tab to open the variable settings window
      4. Select or enter desired engineering unit to scale to.
      5. In the scaling section, the scaling method drop-down list will now have the option for 2 Point measurement
      6. Apply a value to that signal and click Set P1. Apply next value and click Set P2. This will create the 2 point scaling between the physical and engineering unit. All points will be linearized based on this line.

        1. Example: scaling 0-10V to +/-10V
          1. Set the signal generator/sensor to 0V, enter -10V for Point 1 and click Set P1
          2. Set the signal generator/sensor to 10V, enter 10V for Point 2 and click Set P2
          3. Click OK when complete.
            You will notice that when the signal generator is set to 0V, the A101 will display -10V; when set to 10V, the A101 will display +10V. All values in between these two points are linearized:
            Signal Generator Channel
            0V -10V
            2V -6V
            4V -2V
            5V 0V
            8V 6V
            10V 10V
      7. Click OK when complete, then go to Configuration > Write to write updates to the DAQ system.

      Procedure (test.commander)

      1. Connect the controller and add it to the current project. The controller and all I/O modules should be shown in the project space:



      2. Highlight the attached controller and select Online adjust values from the controller:



      3. The online adjustment window will appear.

      4. Click on the variable you want to calibrate and select the Adjustment button to the right:



      5. Select the 2-point calibration by measure:



      6. For this example, we have a signal generator connected to an A101 for voltage input 0-10V. For demonstration purposes, we will set Point 1 to -10V (with an actual input of 0V) and set Point 2 to 10V (with an actual input of 10V). With this calibration, an actual input of 5V will be displayed as 0V.

      7. Set the signal generator to 0V, ensure Point 1 displays -10V, and click Set value.

      8. Set the signal generator to 10V, make sure Point 2 displays 10V, and click Set value.

      9. Click OK when complete.

      10. You will notice that when the signal generator is set to 0V, the A101 will display -10V; when set to 10V, the A101 will display +10V. All values in between these two points are linearized:

        Signal Generator A101
        0V -10V
        2V -6V
        4V -2V
        5V 0V
        8V 6V
        10V 10V

         
        Example: (signal generator set to 8V)



      11. Make sure to update the project to the connected test controller.