Hi All, not sure if this should be in the test or the sensor section, apologies if I have mistakenly placed it here.
I am currently trying to calibrate this Pressure Sensor ( https://www.te.com/commerce/Documen...pdfEnglishENG_DS_SM9000_A1.pdfCAT-BLPS0062) The SM9336 250 Pa differential sensor (range -250/+250 pa). We are using it in a venturi meter, and calibrating it with a known volume syringe (3L). There is a picture of our test set up below. Essentially when we started our test, the count of the sensor (the reading which we receive from the sensor) was 5 at 0 pressure, which converted to pressure was 0.05 pa, so we thought this was our zero error and added this into our formula. The test setup was moved during our test, and each time the zero error would change, ending up at about 20 counts, 4 x our initial zero error. I understand that it shouldn't have been moved, but this sensor is supposed to be going into a handheld device, so it will be moved daily in any case.
I would like to know if anyone has any insight into why this could be happening, is it because the sensor is moving relevant to the MCU ? Whereas in a closed product they wouldn't be moving relative to each other. Would digital signal processing be able to help this ?
Thanks for any help
I am currently trying to calibrate this Pressure Sensor ( https://www.te.com/commerce/Documen...pdfEnglishENG_DS_SM9000_A1.pdfCAT-BLPS0062) The SM9336 250 Pa differential sensor (range -250/+250 pa). We are using it in a venturi meter, and calibrating it with a known volume syringe (3L). There is a picture of our test set up below. Essentially when we started our test, the count of the sensor (the reading which we receive from the sensor) was 5 at 0 pressure, which converted to pressure was 0.05 pa, so we thought this was our zero error and added this into our formula. The test setup was moved during our test, and each time the zero error would change, ending up at about 20 counts, 4 x our initial zero error. I understand that it shouldn't have been moved, but this sensor is supposed to be going into a handheld device, so it will be moved daily in any case.
I would like to know if anyone has any insight into why this could be happening, is it because the sensor is moving relevant to the MCU ? Whereas in a closed product they wouldn't be moving relative to each other. Would digital signal processing be able to help this ?
Thanks for any help
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