Bartington Instruments can now supply Helmholtz Coil systems with active cancellation. This sub-system, the CU2, consists of a closed loop module and reference sensor. These enable active cancellation of DC fields and attenuation of low frequency AC magnetic fields.
The CU2 is used with the CU1 Control Unit and PA1 Power Amplifier, and is compatible with all our existing Helmholtz coils. The reference sensor is used to measure ambient DC fields enabling the closed loop module to compensate for the changes.
The CU2 also provides attenuation of mains power frequency fields up to 33dB for 50Hz and 30dB for 60Hz.