Which action best ensures the credibility of BAS trend data?

• A. Skipping verification of sensor calibrations.
• B. Ignoring time-stamps in data logs.
• C. Recording only aggregate daily values.
• D. Verifying time stamps, sampling intervals, and sensor calibration against calibrated references.

Answer: (D)

Reliable BAS trend data come from measurements that have traceable timing and accurate readings. The best way to ensure credibility is to verify time stamps, sampling intervals, and sensor calibration against calibrated references. Time stamps confirm when each data point was captured, preventing misalignment with events. Consistent sampling intervals ensure the data reflect the true temporal resolution and avoid spacing issues that can distort trends. Verifying calibration against calibrated references ensures sensor outputs reflect actual quantities, maintaining accuracy across sensors and over time. Together, these checks preserve data integrity for accurate performance analysis, fault detection, and energy assessment. Skipping calibration, ignoring time stamps, or recording only aggregate values undermine traceability and temporal detail, reducing confidence in the trend data.