Has anyone done a variance check on multiple BAR30 sensors? We are using two on one system and one on another, so we have a bunch in stock. We noticed a significant offset between the two sensors when installed on a single system and tried to reproduce in a controlled environment in the lab.
Here are two sets of results, using four different BAR30 pressure sensors.
This test uses full oversampling and was performed in a pressure case. The yellow line is the pressure sensor in the Pixhawk (a ModalAI Flight Core). Our calibrated off the shelf pressure sensor (a home weather station) measured the same pressure as the Pixhawk.
This test uses reduced oversampling and was done in my home office.
A graph of the second test pressure, including the Pixhawk. I did not have a COTS reference sensor for comparison.
I have similar graphs from two other sensors, the initial ones we had tested, but those had been in the field numerous times. These four sensors shown in the graphs were new out of the package.
Is this behavior expected?