KLY-3 Kappabridge

Model/Make: KLY-3S/AGICO, Czech


Specimen Size (1)  Spinning SpecimenStatic Specimen
 CylinderDiameter25.4 mm (+0. 2 , -1. 5)25.4 mm (+1. 0, -1. 0)
  Length22.0 mm (+0. 5 , -1. 5)22.0 mm (+2. 0, -2. 0)
 Cube  20 mm (+0.5 , -2. 0)
 Cube 20 mm (+0. 5 , -1. 5)23 mm (+0.5 , -2. 0)
    26 x 25 x 19.5 mm3
 ODP box  40 cm3
 Fragments(bulk. susc.)  
Pick-up coil inner diameter43 mm
Nominal specimen volume10 cm3
Operating frequency875 Hz
Field intensity300 Am-1
Field homogeneity0.2 %
Measuring range0 to 0.2 (SI)
Sensitivity (typical) Bulk measurement3 x 10-8 (SI)
AMS measurement (spinning specimen)2 x 10-8 (SI)
Accuracy within one range0.1 %
Accuracy of the range divider0.3 %
Accuracy of the absolute calibration3 %
HF Electromagnetic Field Intensity Resistance1 Vm-1
Power requirements240, 230, 120, 100 V 10 %
 50 / 60 Hz
Power consumption45 VA
Operating temperature range+ 15 to + 35 oC
Relative humiditymax. 80 %

In principle the instrument represents a precision fully automatic inductivity bridge. It is equipped with automatic zeroing system and automatic compensation of the thermal drift of the bridge unbalance as well as automatic switching appropriate measuring range. The measuring coils are designed as 6th-order compensated solenoids with remarkably high field homogeneity.


The KLY-3 version measures the AMS of a static specimen fixed in the manual holder. In the static method, the same as in KLY-2 bridge, the specimen susceptibility is measured in 15 different orientations following rotatable design. From these values six independent components of the susceptibility tensor and statistical errors of its determination are calculated using software SUSAM. The specimen positions are changed manually during measurement.

The KLY-3S version measures the AMS of a spinning specimen fixed in the rotator. In the spinning method, the specimen rotates with small speed of 0.5 r.p.s. inside the coil, subsequently about three axes. From these data, the deviatoric susceptibility tensor can be computed. This tensor carries information only on anisotropic component of the specimens.


The KLY-3S / KLY-3 Kappabridge is probably the world’s most sensitive commercially available laboratory instrument for measuring bulk magnetic susceptibility and anisotropy of magnetic susceptibility (AMS).