题目内容
步进电机的步距角是指电机转过一个齿距角所需要的脉冲数。
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步进电机可以直接由直流电源来驱动。
Analog multimeters have a LED display and the digital has a needle.
All digital meters contain a electrical motor to power the display so they use virtually no power from the circuit under test.
This means that on their DC voltage ranges they have a very high resistance of 10 MW or more, usually 100 MW, and they are very unlikely to affect the circuit under test.
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