| 摘要 |
Device for measuring tensile force, which is measured during cable laying with the aid of a tensile force meter (5) disposed between the cable (10) and a steel tension cable (11). Said meter comprises a wire strain gauge and a measurement switching circuit, the latter amplifying signals received from the force measuring sensor and converting them to frequency modulated measurement signals proportional to the tensile force. These are passed to a measurement receiver (22) disposed in the region of a winding reel (20), a first lead to the measurement receiver (22) incorporating the tension cable (11), a second lead incorporating the earth (24). The output of the measurement switching circuit, connected with the lead which passes via the earth (24), has a measurement signal carrier frequency of 3 ... 100 kHz, and transmits signals via the earth to the measurement receiver (22) by means of a capacitive coupling (C1, C2, C3) electrically separated from the earth. The cable drawing device (23) and a plate electrode (26) in particular perform the capacitive coupling. |
