I finally managed to get my device (V2.02) to work. Flashing and compiling the openZmeter program took me quite a while to figure out, but now it works very nicely. I recorded voltages so far and would like to try to use it as a energy meter now.
Which coils are you using? Do you built your own? Do you have some recommendations for me?
On the image of the V2.02 device it seems that you are using Rogowski coils from LEM from the ART series? Is that correct? They are quite pricy. Are there any alternatives or are they necessary to get nice precision?