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You're absolutely right, DSO138 will not do it because it only has single channel. I am not aware of any tricks that can allow you to figure out a stepper pinout with just one channel since you need to measure coils simultaneously.Sorry for confusing you with DSO138, I have to stop posting comments on the go:-D
Hello!I advise you to get even the sh*ttiest scope you can get. It is about 20$ including shipping. If you into electronics even a little bit – get a scope. You may not know that you need it, but once you'll get it – you'll find yourself using it more and more.Check aliexpress for DSO138 DIY kit. It costs about 20$ and comes as a kit that you have to solder up yourself. Fun, right? And it is, well, a fully functional scope. A little noisy and not really fast, but hey, $20!It is quite easy to determine pinout of a stepper motor that has 4 or 6 leads, but for 8 lead stepper the only option I am aware of is the scope. Otherwise than that – you can guess the pinout, but it'l take you a looong time and is a very, very much frustrating task.
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