We are currently preparing a larger number of M1K for remote teaching our mechatronics students.
For this purpose, we have mostly received the revision D from our supplier (Farnell).
The ADC of the boards has an offset error of about +1 mV and a gain error of about 3.8%.
The DAC (SVMI, Shape: DC 5 V) has a gain error of only approx. 0.1 % - for the application in electrical engineering practical training this is "0 %".
There is something to be said against having the ADC calibrated by the students as follows:
They measure the offset error with GND as input and the gain error with the DAC activated in SVMI-Mode, Shape: DC 5 V).
They enter these two errors in the menu "Adjust Channel Gain and Offset" and calibrate the voltage measurement via the ADC.
With a 100 Ohm resistor (better 1% accuracy) you then calibrate the current measurement function of the ADC.
In the Analog Devices web pages I read that you should use external reference voltage sources for calibration. Is the procedure described here not sufficient if an overall measurement accuracy of 1 % is sufficient?
I think our students can learn a lot more about this calibration procedure than if they had state-of-the-art measuring equipment.