The AD5535B software takes DAC Code to set the voltage for the 32 channels. I don't know the relationship between the DAC Code and the voltage on the channel. In the datasheet ( https://www.analog.com/media/en/technical-documentation/data-sheets/AD5535B.pdf), there is an equation (page12) that technically should show this relation but in reality, it doesn't. I tested this for V_ref=1 and the following is the output voltage of channel 28 which doesn't follow the equation. Could you help?
Furthermore, at DAC code 0, I would imagine all channels should have a zero voltage but they don't. They are in the range of 0.1-0.3, is this within the accuracy of this board?
#channel 28
DACCode voltage(V)
0 0.116
10 0.119
50 0.182
100 0.834
200 1.900
300 2.936
400 3.995
600 6.105
800 8.22
900 9.29
1000 16.69
1500 21.98
2000 33.62
2500 38.94
3000 49.91
3500 49.94
