In Slimline loggin&, the tool is usually referred to as a s~'e, and the log is normally
made with the sonde moving out of the borehole (which allows for greater control
over the logging speed). The weight of the sonde is carried by an armoured steel cable
or wireline, and the electrical signals brought to the surface through one or more
conducting wires within the wireline.
A winch mounted in the surface logging unit controls movement of the sonde into
and out of the borehole. The logging unit also supplies power to the sonde, takes the
electrical signals from the wireline, processes them, then displays and records the
results as a log. Modern logging units are also capable of analysing the data, and
presenting evaluated results or answer products.