I want to be able to use IIO oscilloscope to take acceleration measurements that I can convert to m/s^2 but i don't understand the output units, what are the units, and are there any settings (shift voltage, input voltage?) that would impact the sensor output.
I have an accelerometer (https://www.pcb.com/products?m=350d02) attached to https://www.analog.com/media/en/reference-design-documentation/reference-designs/cn0540.pdf which is mounted to https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=165&No=1046#contents. I connect through a serial connection through Putty from laptop to de-10 nano and also an ethernet to pull the ADC data to IIO Oscilloscope.
I am able to collect readings and save out as a .csv, however I am not sure what the units are so that I can convert them to acceleration units (m/s^2). I tried multiplying the .csv array by the ad7768-1 voltage0 scale value (0.000488281) as i assumed that was the conversion needed to get units of millivolts, and since the sensor has range of -5000mV to +5000mV divided the resultant array by 5000 to get a scale of -1 to 1. Do check if this was correct I then compared these values to the values given from the .mat export from IIO oscilliscope with "scale to +-1" selected. The results were in the same ballpark but off by 15%. I also compared to results from the same sensor, but with a different DAQ, and the results were also different.
I also noticed that altering the "shift voltage" has a large affect on the scale of the output and I am not sure what it means. Could you explain what "shift voltage", input voltage", and "sensor voltage" under the "sensor calibration" heading mean?