FIELD: deep investigations of wells. SUBSTANCE: device for measuring cable lengthm motion speed and tension has measuring unit 7 and guide units 9 and 10. Located between side walls 1 and 2, mechanism 34 of installation of transducer 14 of magnetic marks. Mechanism 34 has lever 36 spring- loaded with spring 37 to the side of cable 12. Installed in recess of lever is roller 35 contacting cable 12 and transducer 14 is located on the side opposite to roller 35 relative to cable 12 at distance a on plate 38 rigidly connected with lever 36. EFFECT: higher measurement accuracy due to preservation of distance between cable and magnetic mark transducer. 4 dwg
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