DEVICE FOR MEASURING DEPTH OF LOGGING Russian patent published in 1996 - IPC

FIELD: measurement technology. SUBSTANCE: device has magnetic field sensitive elements, connected in series and forming differential magneto-modulation converter, two comparators, RC-flip-flop, count-control pulse former, logic gate, counter, decoder, magnetic mark generator, pulse magnet. Marking of logging cable is performed when the device is hoisted on the cable. As a result, the factors, which effect on length of the cable, may be excluded, for example, changes in weight of the device and speed of logging. Demagnetizing effect of pipes is reduced onto the marks, painted onto the cable. EFFECT: widened functional capabilities; improved noise immunity of the device. 2 dwg