Because of the lowtest current level used, a very sensitive voltmeter is required to measure the voltage drop, which is usually in the microvolt range.
由于所使用的测试电流很低,所以就需要非常灵敏的电压表来测量这种通常在微伏范围的电压降。
2
Shielding may also be applied to a conductor carrying a high level testvoltage to prevent interference with nearby low level circuits.
承载高测试电压的导体也应该采用屏蔽,以防止与邻近的低电平电路发生干扰。
3
Position and speed are obtained by an observer using a voltage and an inductance motor model together with test signal injection at low speed.