| 摘要 |
The invention relates to a long body, for example a gas-insulated electric line ( 1 ), the condition of which is tested by an electronic signal that is supplied to the body and then received by a receiver unit. The electronic signal has a predefined duration and form. The receiver unit receives signals, evaluates them in terms of duration and/or form and identifies the signals as the supplied signals or discards them as interference signals.
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