Hi Savarit,
We do not recommend BMP280, BMP390 for new designs. We recommend using BMP581 and BMP585 in the new design, as they have higher performance: low power consumption, low noise, and small size. We provide a reference method for calibrating barometers:
Requirement
A highly accurate reference sensors (absolute accuracy below ±10 Pa)
A well-controlled production environment, no fast pressure changes, e.g. airflow, door open/close
Wait at least 24 hrs after soldering
Procedure
Device must be on the same plane as the reference
Sensor configuration: ultra high-resolution mode, 16 times measurements for average à P sensor
Average pressure reading from the reference à P reference
Record P sensor – P reference in device memory, e.g., /system, by which future sensor readings will be subtracted
An iteration of step 2~4 may optimize the calibration (optional)
Criterion is up to production environment, test duration, facility, etc. e.g., 10 Pa
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