Thanks for the note, i edited the post.
I haven't monitored the reference voltage over a longer period of time, but everytime i checked it has been the same.
I don't get why i would change, i don't have any active load connected at all so there is literally nothing going on.
The reason i'm using the external reference voltage is to have a stable and reliable reference since i was told the internal reference can change quite a lot when loads are active (right now that really didn't work out, haha).
The connection is the standard LM4040 connection as should below. It's basically a 5V reference, but it drops to 4,84V since i'm powering it with only the 5V arduino output.
