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)
- Click Read to load connected DAQ system's configuration into project window (or open existing project that matches configuration to connected hardware)
- Switch to the Data acquisition tab to start acquisition
- Either right-click > Edit variable from the data acquisition or configuration tab to open the variable settings window
- Select or enter desired engineering unit to scale to.
- In the scaling section, the scaling method drop-down list will now have the option for 2 Point measurement
- 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.
- Example: scaling 0-10V to +/-10V
- Set the signal generator/sensor to 0V, enter -10V for Point 1 and click Set P1
- Set the signal generator/sensor to 10V, enter 10V for Point 2 and click Set P2
- 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
- Example: scaling 0-10V to +/-10V
- Click OK when complete, then go to Configuration > Write to write updates to the DAQ system.
Procedure (test.commander)
- Connect the controller and add it to the current project. The controller and all I/O modules should be shown in the project space:
- Highlight the attached controller and select Online adjust values from the controller:
- The online adjustment window will appear.
- Click on the variable you want to calibrate and select the Adjustment button to the right:
- Select the 2-point calibration by measure:
- 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.
- Set the signal generator to 0V, ensure Point 1 displays -10V, and click Set value.
- Set the signal generator to 10V, make sure Point 2 displays 10V, and click Set value.
- 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 A101 0V -10V 2V -6V 4V -2V 5V 0V 8V 6V 10V 10V
Example: (signal generator set to 8V) - Make sure to update the project to the connected test controller.