Overview

The IndySoft Uncertainty Module allows for setting uncertainty budgets, including master rules, contributing item details, studies, and correlations. These uncertainty budgets can then be associated with selected equipment test points and any necessary attribute information.

When calibrations (or any events accessing test points) are performed in IndySoft, as each test point's readings are measured, the related uncertainty budget is found (if any). The master rules are checked for this budget to ensure the correct standards are selected for the calibration event. If not, the user is notified within the calibration event that uncertainty cannot be correctly calculated.

Next, IndySoft loops through the contributing items for this uncertainty budget. For each contributing item, it checks whether the item is 'Auto' or not. If a contributing item is 'Auto,' then the 'Standard Uncertainty' number is returned into the uncertainty calculation. If non-Auto, then the VBScript formula for this contributing item is executed to return the Standard Uncertainty. This VBScript can use live data from the event being performed, attributes of the unit under test, attributes of one of the masters being used in the calibration, contributing item fields, etc. Once all the Standard Uncertainty values are returned for each contributing item, IndySoft checks for a Correlation Formula. If this formula is found, it is executed to return the Uncertainty for the current budget (this Correlation Formula will calculate based on the Standard Uncertainty returned by each Contributing Item). Suppose a Correlation Formula is not found ('Default (Root Sum Squared)' is selected for the budget). In that case, IndySoft assembles the 'Standard Uncertainty' for each Contributing Item, performs a root sum squared, and then returns this value multiplied by two into the Uncertainty test point field within the calibration event.

The uncertainty budget's unit of measure and resolution can also be copied into a custom test point field at the time of the calibration based on settings in the Uncertainty Module. |