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-active filters provide gain -consider frequency range: *active: up to 100 MHz *passive: up to 1000 MHz -passive filters are less sensitive -active filters are light, small and inexpensive -active filters require power supplies

When the ground subjected to the lightning, it will effect the value of earth impedance to be change. This will cause the ground potential rise to a dangerous level. What method can use to measure the earth impedance due to the lightning surge?

Actually the earth should be zero voltage. By when the downconductor subject to the lightning, it will cause the ground potential rise. What is the estimate value of this ground potential rise?

In all lightning system, the conductor are buried to the ground in a specific depth. The impedance of it is measured using da excitation. This technique is not strictly use when the conductor is diverting a high frequency sources to ground such as lightning current. What method is suitable to...