You need multimeter and similar procedures like these [
www.youtube.com]. "Tuning stepper driver" is your search term. "stepper driver current", "reprap stepper driver", ect.
If you use ground on the driver to measure V, be careful and have spares on hand.
If you use other ground? I have never done that way, idk if it's exactly the same reading, but enough people seem to say it's okay.
As far as what values? Idk. But if you post yours, and someone has the same printer as you, they could provide more input.
Edited 2 time(s). Last edit at 05/12/2017 04:18PM by VonRansak.