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Multi & Single Frequency Kappabridges

Magnetic Susceptibility/Anisotropy Systems
Manufactured in the Czech Republic by AGICO s.r.o.


The world's most sensitive commercially available laboratory instruments for measurement of:

  • Anisotropy of magnetic susceptibility (AMS)
  • In-phase and out-of-phase susceptibility in variable magnetic fields at up to 3 different frequencies
  • High and Low Temperature variation of susceptibility, with optional CS-4/CS-L accessories

4 Available Models

3 Operating Frequencies
MFK1-FA (spinner) and MFK1-FB (static)

Single Operating Frequency
KLY5-A (spinner) and KLY5-B (static)

MFK1 Data Sheet
MFK1 User's Manual

KLY5 Data Sheet


Main Features

  • High sensitivity 2 x 10 -8 (SI)

  • Fully automatic zeroing system

  • Measurement of in-phase and out-of-phase susceptibility

  • Variable measuring fields

  • Three operating frequencies

  • Rapid AMS measuring (MFK1FA, KLY5-A)

  • Autoranging

  • Built-in circuitry for controlling the optional CS-4 Furnace and CS-L Cryostat

  • Advanced diagnostics

  • Sophisticated software support

  • Optional 3D Rotator (MFK1-FA & KLY5-A)





General Description

MFK1 and KLY5 Kappabridges consist of the pick-up unit and control unit connected with the DPU1 data processing unit.

In principle the instruments represent super-precise, fully automated inductive bridges.  They are equipped with automatic zeroing system (in both real and imaginary components) and automatic compensation of the thermal drift of the bridge unbalance as well as automatic switching to appropriate measuring range.

The measuring coil is designed as a compensated solenoid with an outstanding field homogeneity.

MFK1-FA and KLY5-A  Kappabridges
Spinner/Static Combination

Both models measure the AMS of a slowly spinning specimen. One has to adjust the specimen only in the three perpendicular positions. The measurement it rapid (about 2 minutes per specimen) and precise, profiting from many susceptibility determinations in each plane perpendicular to the axis of specimen rotation. The bridge is zeroed prior to the anisotropy measurement after inserting the specimen into the measuring coil, thus the most sensitive range can be used.  Special software combines the measurements in three perpendicular planes plus one bulk value to create a complete susceptibility tensor. The errors in determination of this tensor are estimated using a special method based on multivariate statistics principle.

The instruments can also do fully automated measurement of the field variation of both the in-phase bulk/mass susceptibility and relative changes of phase angle.  The measurements are made in 20, 15, and 10 distinct fields, respectively.  It is possible to perform short runs of this measurement using a reduced number of distinct fields.  In addition, user configuration of measuring fields is also available.

Available accessories for the MFK1-FA and KLY5-A include:

  • 3D Rotator - for fully automated measurement of anisotropy of magnetic susceptibility

  • CS-4 - furnace appararus for high temperature susceptibility mesurements

  • CS-L - cryostat for low temperature susceptibility mesurements


MFK1-FB and KLY5-B  Kappabridges
Static only versions

 Laboratories under budgetary constraints may prefer the lower priced static only models.  For the AMS determination, the specimen susceptibility is measured in 15 different positions following rotatable design. The positions are changed manually and, by using the included special software, the susceptibility tensor is calculated including the statistical errors of its determination.

These models can be upgraded to fully-functional spinner instruments at a later time.



For Spinner Operation

For Static Operation

Cylinder: 25.4 mm diameter; 22 mm length
Cube: 20 x 20 x 20 mm
Cylinder: 25.4 mm diameter; 22 mm length
Cube: 20 mm on edge or 23 mm on edge
ODP type Boxes 26 x 25 x 19.5 mm
Fragments: up to 40 cc for bulk susceptibility


Sensitivity (in 400 A/m field): 3 x 10-8 SI (bulk); 2 x 10-8 SI (aniso)
Operating Frequency: MFK1-FA & FB    976 Hz, 3904 Hz, 15616 Hz
MFK1-A & B        976 Hz
Specimen spinning frequency: 0.4 Hz
Field Intensity Ranges (peak values): 2 - 700 A/m @  976 Hz
2 - 350 A/m @ 3904 Hz
2 - 200 A/m @ 15616 Hz
Field Homogeneity at 976 Hz: 0.5%
Measuring Range (Automatic): up to 0.5 (SI) at 976 Hz
at 976 Hz, 400 A/m peak
at 3904 Hz, 200 A/m peak
at 15616 Hz, 200 A/m peak

2 x 10-8 (SI)
6 x 10-8 (SI)
12 x 10-8 (SI)
Accuracy within one range: 0.1%
Absolute accuracy calibration: 3%
Pick-up coil inner diameter: 43 mm
Power: 100-240 V; 50/60 Hz, 40VA
Operating temperature range: +15 to +35 deg. C
Relative humidity: up to 80%
Measuring Unit Dimensions: 23 x 21 x 12 cm; 4 kg
Pick-up Unit Dimensions: 27 x 35 x 32 cm; 11 kg


Please contact John Toth at for additional information or a price quotation.

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