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SunFounder 250 - Wiki
http://wiki.sunfounder.cc/index.php?title=SunFounder_250
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Figure 2-2
3. Motors Test
Test Operations (power-off):
1. Test by multimeter: set the multimeter to the 200Ω setting to measure the direct-current resistance of the motors’ three-phrase winding - check two wires
from three each time as shown below. The measured results of three times should be very close to each other. If the gap among the results is more than
10%, an inter-turn short circuit may have happened between the wires with the smallest result.