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19.11.2
# f/ I0 U& L8 _8 m/ m( TThe appliance is supplied at rated voltage and a variable resistor, adjusted to its maximum resistance, is connected between the point to be investigated and the opposite pole of the supply source. The resistance is then decreased until the power consumed by the resistor reaches a maximum. Points closest to the supply source at which the maximum power delivered to this resistor does not exceed 15 W at the end of 5 s are called low-power points. The part of the circuit farther from the supply source than a low-power point is considered to be a low-power circuit.
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, Z% n+ d9 r) r7 g7 {6 K6 V8 b7 q是不需要断开后面的电路的。一般1)RC降压,2)开关电源的二极管以后,就是低功率点。 |
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