Table Of Contents

Shunt Calibrating One or More Channels

Last Modified: March 11, 2020

Apply shunt calibration to one or multiple bridge circuit channels simultaneously.

Use shunt calibration to adjust for errors on your bridge circuits caused by resistance of the lead wires between the EX pins on the device and the strain gage.

To use shunt calibration, channels must support strain/bridge measurements and be properly configured. Ensure that Bridge Configuration and Bridge Resistance are specified for any channels you want to perform a shunt calibration on. Refer to the Supported Hardware topic to confirm that your device supports strain/bridge measurements.

  1. In your Channel Specification document, select all configured strain channels you wish to calibrate.
  2. In your Channel Specification document toolbar, click the Calibrate channels button .
  3. Select the Shunt calibrate option.
  4. Specify the shunt calibration parameters.
    Option Description
    Source
    • Built-in—Use the module's internal shunt resistor
    • User-provided—Use an external shunt resistor
    • Accessory—Use the internal shunt resistor of a connected accessory
    Location Specify the location of the shunt resistor on the bridge sensor.
    • R1—Between VCH- and VEX+
    • R2—Between VCH- and VEX-
    • R3—Between VCH+ and VEX-
    • R4—Between VCH+ and VEX+
    Value Specify the value of the resistor you are using. If you are using the Built-in option, refer to your device documentation for this value.
  5. Click Apply. Channels must be configured, and should not be disabled or contain any errors. If any errors are present on the channel, the Apply button will not be available. If there are any shunt-related errors during calibration, the calibration toolbar remains visible and displays the number of channels that failed calibration. Each channel that failed shunt calibration displays an error in the Channel Specification.
  6. If necessary, resolve any shunt calibration errors that appear.

    An error can occur for the following reasons:

    • The channel received one or more unsupported shunt configuration parameters.
    • The calculated shunt gain adjustment value is out of range (0.5, 1.5), due to one of the following factors:
      • An issue exists on the sensor, such as physical damage or data corruption.
      • The sensor was disturbed or not at rest during calibration.

    After the errors are resolved, select the affected channels and click the Apply button to perform the shunt calibration and clear the error notifications on the channels.

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    Note  

    If you wish to proceed without fixing the error or the error cannot be fixed, you can clear the shunt calibration errors in one of the following ways:

    • Close the calibration toolbar. Uncalibrated channels will retain their previous values.
    • Choose a different calibration type, Null offset or Zero.
  7. Hover over the calibration icon on any calibrated channel to see the values from the last calibration performed.

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