Yes, that’s what I think is happening. I think it’s a high frequency PWM signal but we’re ending up with an RMS value rather thank the peak. It’s just a guess but seems to work out. Can’t be sure without a scope though 
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I didn’t try measuring in AC mode, I will next time I hook them up though. I’m not sure how it’ll show up when stationary though as I don’t think the current through the coil will reverse until you start stepping.
Sorry, meant .1 ohm. No idea why I said 100 ohm, will fix it in a sec. Brain fart I guess lol.