Custom Numeric Limit Test Step Type Shows an Error in Step Settings in TestStand 2016

Updated Jan 8, 2019

Reported In


  • TestStand 2016

Issue Details

  • I have a custom step type based off the numeric limit test from TestStand 2014 SP1 or earlier that shows An error has occurred. Save your work and restart the sequence editor on the Limits tab of the step settings in TestStand 2016 as shown in the image below. 
  • Restarting the sequence editor does not resolve the error


To add EQT support to existing step types, we have created a tool that you can use to update your custom step type to include the new properties in the Limits container, and update the Status Expression and Description Format properties. 
  1. Download the attached “Add EQT to Numeric Limit” and extract the files.
  2. Make sure your custom type is loaded into TestStand memory.
  3. Open Add EQT to Numeric Limit Test.seq and run the sequence.
  4. Select your custom step type from the drop down menu.
  5. Hit the Update button to update the Limits container, the Status Expression, the Description Format, and increment the version.
  6. Already existing instances of the step type will need to have their Status Expression properties updated as well, select a directory containing the sequences to update any instances of the type and hit the Update Instances button.

Additional Information

TestStand 2016 introduced new support for EQT measurements with the Numeric Limit Test. This required the addition of extra properties to the Limits container in the step type. Custom step types based off the Numeric Limit Test created in TestStand 2014 SP1 or earlier will not contain these extra properties and will cause the above error to occur in TestStand 2016. TestStand 2016 also updated the Status Expression property and Description Format property to reference the new properties.

TestStand 2016 f2 Patch introduced a fix to allow existing custom numeric limit step types to run without encountering this error, however the steps will still need to be updated to add support for the new EQT feature.


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