| 摘要 |
The method measures the impedance of an earth connection 14 over a wide range of radio frequencies and involves the sending 2 of a pulsed current wave, its transmission through a coaxial cable 4 to the earth connection, the measurement of the current arriving at the earth connection, and the measurement of the voltage between the earth connection under test and an auxiliary earth connection as a function of time by pulse diagrams. The device sending the pulsed current wave is connected to a second auxiliary earth connection 6 situated at a distance from the unknown earth connection twice that of the first, the current and voltage between the earth connection under test and the first auxiliary earth connection are recorded as a function of time on an oscilloscope 9, the curves obtained are photographed, and a Fourier transform is carried out on the recorded values of current and voltage in order to obtain their variations as a function of frequency, followed by a determination of those of the earth connection by division. <IMAGE>
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