Table Of Contents

Shunt Calibrating One or More Channels

Last Modified: May 27, 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 you must properly configure them. Specify Bridge Configuration and Bridge Resistance 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 want 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 Calculate. Configure the channels and ensure they are not disabled or contain errors. You cannot perform shunt calibration on channels with errors.

    After you perform a calculation, the details of each channel update to display the calculated shunt gain adjustment value. If the calculated value is outside the valid range (0.5, 1.5), the channel fails the calculation. If any channels fail shunt calculation, the calibration toolbar displays an error icon along with the number of failed channels. Each failed channel displays an error in the Channel Specification document.

  6. Resolve any shunt calibration errors.

    A channel can receive an invalid calculated shunt gain adjustment value for following reasons:

    • The channel received one or more unsupported shunt configuration parameters.
    • An issue exists on the sensor, such as physical damage or data corruption.
    • The sensor was disturbed or not at rest during calibration.
  7. After resolving errors, select the affected channels and click Calculate to calculate a new shunt gain adjustment value. If the new calculated value is within the valid range, the error on the channel is cleared.
    spd-note-note
    Note

    If you want 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.
  8. Click Apply all. All channels with a valid calculated shunt gain adjustment value apply the value, completing the shunt calibration. The details of each channel update to display the applied value and a timestamp of when the value was applied. If no channels with an invalid calculated value remain, the calibration toolbar dismisses itself.
  9. After the calibration toolbar dismisses, hover over the calibration icon on any calibrated channel to see the values from the last calibration performed.


Recently Viewed Topics