0
\$\begingroup\$

In my research, I use smartphones pressure sensor data, and I need to understand their errors and limitations. I found the technical chart for the sensor:

BOSCH BMP 180 Pressure Sensor

But I don't really understand the meaning of the absolute accuracy of -4 .. +2 hPa in the chart, and what is the difference between the absolute and relative accuracy here.

Can anyone help?

Thank you!!

\$\endgroup\$
0
\$\begingroup\$

Calibration of any sensor requires precise control of gain and offset error as well as temperature correction. This can and is often much more than the incremental resolution and the relative accuracy.

Absolute accuracy> Relative accuracy> resolution depends on the quality of the design in overcoming many factors that contribute to gain , offset and non-linearity.

The same is true for DMM's with 3 digits that might have +/-1 least significant digit (LSD) relative accuracy but maybe +/-2 LSD of offset and 0.1% gain error thus absolute error is the sum of both these. (hypothetical example)

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.