Tool/software:
In our ongoing project with the PGA300EVM, we aim to calibrate and verify the performance of the device when used with our in- sensor. Our pressure sensors are affected by temperature. The primary goal of our work is to ensure that the PGA300EVM provides precise and reliable readings by temperature compensation. We began by connecting an external pressure sensor to the designated input pins on the PGA300 EVM. Utilizing the guided calibration process within the GUI, we set temperature and pressure points, applying known values to the sensor. We manually set specific voltage values corresponding to the DAC codes 766, 1800, and 2700, which are 0.145 V, 0.47 V, 0.763 V respectively (We got this value connecting a multimeter to TP30 and TP39). Our first query is, is this the right way?and, How to get the desired value? For example, if I use default desired value the DAC calculation doesn't work. Therefore we used the same exact value we got from the DAC as desired value.
After calibration, we were directed to the accuracy verification test to verify the stored coefficients to ensure they align with the expected sensor outputs. Our question is, how do we get the values here? For example, which pins of the EVM do we need to connect with the multimeter to get the values for AVT? We tried TP30 and TP39. It doesn't give any values.
The normal pressure values, and the clamp values are set to default which is 0V and 1.253V. What is the significance of these values and how do we change it? We tried changing from the first page of guided calibration. However, it came back to 1.253 with an error(Some values in the calibration files are out of range).
Although, there were issues with AVT and normal/clamp values. We still went on with the calibration and completed it. After it was done, the coefficients were populated, then, we switched to OWI mode to get the data in ADC graph. What we found out is somewhat compensated. Is it the correct way to do it? Or do we need to do anything in compensated mode? Is there a way to find out that the compensation mode is working?
Finally, if the compensation is working, how do I save the acquired data through compensation? Additionally, are there any pins on the EVM board that provide analog outputs of the compensated values which can be transferred to a commercial DAQ(such as NI USB 6212 analog inputs pins)? Or are there any ways to directly get the compensated data to a LabVIEW VIs.
We have limited knowledge of working with PGA300 or similar devices. We have gone through the documents of PGA300, PGA300 EVM and PGA300 GUI. Still, we could not solve our issues. A detailed explanation of our issues would be helpful and highly appreciated.
