What is the acceptance criterion for drift test results?

• A. Results must not exceed manufacturer specifications
• B. Results must be within manufacturer specifications
• C. Drift results are not evaluated
• D. Results must be within 0.01 of target

Answer: (B)

Drifts tests measure how far an instrument’s output wanders from the true value under defined conditions. The acceptance criterion is that the drift must stay within the tolerance specified by the manufacturer. This ensures the device remains accurate enough for safe and reliable operation. If the measured drift exceeds that spec, calibration, adjustment, or replacement is required.