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2. DESCRIPTION OF THE INSTRUMENT
2.1 Operating Principle
The fundamental part of the instrument is an LC
oscillator of 10 kHz, the inductivity of which is embodied
by a flat measuring coil situated at the active face of the
instrument. The susceptibility measurement is performed
in two steps. The frequency of the oscillator is measured
with the coil at some distance from the rock (free space
measurement) and then with the coil applied to the rock
surface. From the frequency difference the true
susceptibility is computed by the built-in microcomputer
and then displayed. For the details see
section 4.
Measuring methods
.
2.2 Design
The use of a microprocessor and LSI circuits of very low
power consumption made it possible to decrease the size
of the instrument to such an extent that the KT-6 could
be designed for one-hand operation. A robust leather
case, which can be either carried on a strap over the
shoulder or worn on a waist-belt, facilitates the KT-6 field
manipilation.
The instrument case consist of two hermetically insulated
compartments. The water- and dust-proof front
compartment contains all electronics together with the
measuring coil, touch switches and display. The battery
and the set switch are housed in the rear compartment
covered with a lid - see Fig.1.