Full/Span Calibration Procedures are performed every 30 days.

• A. 15 days
• B. 60 days
• C. 90 days
• D. 30 days

Answer: (D)

Regular calibration keeps measurement accuracy by correcting drift that occurs in sensors and electronics. A full calibration checks the entire measurement chain against a reference, resetting all parameters to true values, while a span calibration verifies that the output correctly represents the full range of input signals. Doing both on a monthly cycle catches drift before it accumulates enough to degrade data quality, fits typical maintenance windows, and balances the need for readiness with the time required to perform the procedures. Doing it more often wastes effort without substantial accuracy gains, while doing it much less often risks readings drifting outside acceptable tolerances. So a cadence of every 30 days is appropriate to maintain reliable performance.