What are the differences of the absolute accuracy, relative accuracy and noise of pressure sensor？

[fyli]

Hello,

I would like to ask you what are the meanings and differences of the absolute accuracy, relative accuracy and noise of the pressure sensor such as BMP 581? What items are included in the above three indicators, and how are they measured and calculated?

Thanks in advance,

Fengyang

[BSTRobin]

Hi fyli,

For detailed measurement and calculation information, we have not released public document.

Absolute pressure: when result has to be compared against an external reference, such as get current altitude with sea level pressure from the internet.

Relative Pressure: when the result has to be compared against a previous measurement, such as:
Floor level detection with offset zeroing when entering the building
Height difference between drone and remote control

Noise is a unwanted part of the signal and has to be smaller than the signal that the user wants to measure.