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About IIG Observatory Instruments and Facilities

JR 6 Spinner Magnetometer

Instrument Details
Make: AGICO, Czech Republic
Model: JR-6 upgraded to JR-6A

Sensitivity: 2.4 ´ 10 -6 A/m
Measuring range: up 12500 A/m
Speed of rotation: 87.7 and 16.7 rps
Accuracy: ±1%


The sample rotates at a constant angular speed in the pickup unit inside a pair of Helmholtz coils. In the coils an AC voltage is induced whose amplitude and phase depend on magnitude and direction of the remanent magnetization vector.

The instrument consists of a spinner/pickup unit and a measurement control unit. All functions are microprocessor controlled, including digital filtration of the signal, control and test of the speed of specimen rotation, and execution of automatic tests for erroneous conditions. The measurement process is fully controlled from a computer.


The changes of Earth’s magnetic field in geological history can be investigated through the measurement of sample’s remanent magnetization and its magnetic stability in:

  • Environmental Magnetism
  • Archaeomagnetism
  • Paleomagnetism
  • Mineralogy

Dimensions of specimen to be measured

Cylinders (regularly shaped specimens) Diameter 25.4 mm Length 22.0 mm

Cubes 20 ´ 20 ´ 20 mm

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