HELMHOLTZ COIL SYSTEMS HELMHOLTZ COIL SYSTEMS WITH ACTIVE CANCELLATION FOR HIGH PRECISION CALIBRATION OF MAGNETOMETERS AND MAGNETIC MOMENT MEASUREMENTS Coil diameter 350mm >1mT field at DC >100µT at 5kHz Coil diameter 500mm >500µT field at DC >100µT at 3kHz Coil diameter 1m >250µT field at DC >100µT at 300Hz Coil diameters 1.3 or 2m >480µT field at DC (1.3m) >240µT field at DC (2.0m) POWER AMPLIFIER AND CONTROL UNIT AVAILABLE FOR CONNECTION TO NATIONAL INSTRUMENTS™ ACQUISITION UNIT. US distributor: www.gmw.com www.bartington.comhttp://www.bartington.com http://www.gmw.com