Innovation in Magnetic Field Measuring Instruments

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Helmholtz Coil Systems and Testing Equipment

Bartington Instruments supply a range of Helmholtz Coil systems for creating stable homogeneous magnetic fields.

They consist of an assembly of up to three pairs of coils, each generating a field along a specific axis connected to a Power Amplifier (PA1) and Control Unit (CU1) which interfaces with a National Instruments™ acquisition card. They are supplied with a mounting table to hold the test item during operation.

The CU2 Closed-Loop sub-system, comprising of a control module and reference magnetometer, allow for active compensation of DC magnetic field variations, and attenuation of AC magnetic fields up to mains frequencies. This additional module can be easily fitted onto existing systems, or supply with new system. The use of this module will greatly facilitate the setup of the complete Helmholtz Coil System.

They are used for calibration and testing of magnetic instruments, and in laboratories for producing stable magnetic environments.

HC1 has a coil diameter of 500mm, and can produce a 0.1% homogeneous field in a volume of 260cm3. This coil is available as a single, two or three-axis unit. The HC1 can generate fields of up to 500μT at DC, and 100μT at 3kHz.

HC2 Designed for testing larger items, the HC2 has a coil diameter of 1m, and produces a homogeneous field to < 1% error in a volume of 14000cm3, and < 0.1% error in a volume of 2500cm3. For ease of shipping and installation the HC2 comes in a flat-pack form for customer assembly.

HC9 This is the smallest of Bartington Instruments' range of Helmholtz Coils, with a nominal coil diameter of 350mm, built on aluminium coil formers. It can generate a homogeneous magnetic field of up to 1mT from DC to 440Hz and over 100μT at 5kHz. The HC9 produces a homogeneous field to < 0.1% error in a volume of 175cm3, and < 1% error in a volume of 1150cm3.

HC16 This is the smallest of Bartington Instruments' range of Helmholtz Coils, with a nominal coil diameter of 350mm, built on non-conductive coil formers. It can generate a homogeneous magnetic field of up to 1mT from DC to 440Hz and over 100μT at 5kHz. The HC16 produces a homogeneous field to < 0.1% error in a volume of 175cm3, and < 1% error in a volume of 1150cm3.

Ferronato™ Coils For testing larger objects Bartington Instruments can supply Helmholtz coils manufactured by Serviciencia S.L., which are compatible with the Bartington PA1 Power Amplifier and CU1 Control Unit. These offer coil diameters of 1.3m (BH1300) and 2m (BHC2000).

Helmholtz Coil Control System includes the PA1 Power Amplifier, CU1 Control Unit and CU2 Closed-Loop Module and allow for the generation and control of the current to be applied to the Helmholtz Coils.

Test Equipment

We also produce systems for equipment testing:

Degaussing Wand This is a handheld instrument that produces an alternating field and is used to remove remanent magnetisation accumulated in equipment such as magnetic shields.

Magnetic Shields These cylindrical chambers made of Mumetal attenuate the Earth’s magnetic field of ~50,000nT to a level of ~1nT. They can be supplied open-ended or with capped ends to reduce noise.