Tolerance limits on data sheets
Tolerance is an acceptable value or value range for a specified output value. You define the tolerance limits for accuracy of a calibration point on a data sheet.
You can specify up to four tolerance levels on a data sheet. Tolerance 1 is the tightest (or narrowest) tolerance and Tolerance 4 is the widest. Typically, the manufacturer of the asset establishes the tolerance limits.
Example of using tolerance limits
Tolerance 1 is the output limit range that does not require adjustment for the asset. An asset passes calibration if the actual output value for the asset is within the limit range of Tolerance 1. No additional action is required.
The asset requires adjustment if the actual output value exceeds the limit range of Tolerance 1 but is within the limit range of Tolerance 2. The asset owner is also notified.
- Tolerance 1 lower limits > Tolerance 2 lower limits > Tolerance 3 lower limits > Tolerance 4 lower limits
- Tolerance 1 upper limits < Tolerance 2 upper limits < Tolerance 3 upper limits < Tolerance 4 upper limits
- The lower tolerance limit value, the From field, must be less than or equal to zero.
- The upper tolerance limit value, the To field, must be greater than or equal to zero.
When a technician enters As-found and As-left values on the work order data sheet, these values are validated to ensure that they are within the specified range.