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I can start off with the calibration process and when I'm calibrating the W1. It measures -0.01V for 0V from the software and so on. At -5V the multimeter I use to calibrate the analog discovery devices shows -5.9V. After this the calibration prompt on the software says 0V but the output from the board does not go back to 0V or -0.01V. If I restart the Discovery 2, I will be able to measure -0.01V for 0V again. How do I successfully calibrate this device? Thanks