The active filter acts as an infinite impedance to the external for the fundamental frequency and as a low resistor for harmonic frequencies.
对外电路而言，在基波频率下有源滤波器被控制为无限大阻抗，在谐波频率下被控制为小电阻。
2
It is possible for the feed system to have a lowimpedance, looking downstream from the pressure source at a certain frequency.
在压力源下游，供应系统在某一频率下可能有一低的阻抗。
3
The endurance test is a rigorous test for the total performace of a tantalum electrolytic caparitor due to its lowimpedance, small leakage, high frequency charateristics and high reliability.