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1-2使用万用表时,应注意哪些问题? 答:使用万用表时,除选择合适的测试项目和量程外,主要应考虑电表内阻对被测电路的影响.如测电压时,若被测电路阻抗较大,而内阻又较小,则内阻所造成的分流不可忽略,此时实测电压下降. 1-3使用示波器时,对地线有何要求? 答:示波器的地线必须与被测电路地线良好联接.这一点对于用电源变压器的接收机来讲并不困难.然而对于无电源变压器的接收机来讲,则非常困
1-2 When using the multimeter, what problems should be noted? A: When using the multimeter, in addition to select the appropriate test items and range, the main meter resistance should be considered on the circuit under test. If the measured voltage, if the circuit under test Impedance is larger, while the resistance is smaller, the shunt caused by the internal resistance can not be ignored, when the measured voltage drop. 1-3 using the oscilloscope, the ground what are the requirements? A: The oscilloscope ground must be Measuring circuit ground well connected.This is not difficult for the receiver with the power transformer.However, for the receiver without power transformer, it is very sleepy