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April 2018: GMW is Exhibiting at International Particle Accelerator Conference (IPAC), Vancouver, April 29th - May 2nd GMW will be exhibiting at IPAC18 in Vancouver, Canada. The conference opens with a reception Sunday Evening April 29th in the Exhibit Hall. The exhibition remains open all day Monday through Wednesday. GMW is in booth 703. Metrolab Technology will have the booth adjacent, number 701. For details see: https://ipac18.org/about/ GMW will be showing: From Bergoz Instrumentation, accelerator beam diagnostics for beam current, position and profile. Featured is the new CWCT and BCM-CW for measurement of the average current of CW or macropulse beams up to 500MHz RF with resolution <1uA and dc to 100kHz output bandwidth independent of bunch shape/width. The CWCT is ideally suited to sub-relativistic proton/ion beams, to measure loss along the accelerating path. From Bartington Instruments, Cryogenic Fluxgates for magnetic field monitoring in cryocavities, as well as 3-axis room temperature Fluxgates for environmental field measurements with mG resolution and response from DC to 12kHz. From Danisense, very high accuracy, ultra-stable, DC Current Transducers from 20A to 12kA with optional built in full-scale calibration windings and options for current or voltage output. From GMW, clamp-on current probes for currents from 250A to 16kA. Frequency from DC up to 75kHz and accuracy of +/-1% are suitable for redundant dc or ac current monitoring or troubleshooting of magnet power supply outputs. From Group3, sub-mG resolution digital magnetic field probes for DC fields with electrical and fiber optic outputs. Calibrated probes to 9T are available. From HTS-110, High Temperature Current leads for superconducting magnet applications. From PPM, DC-40MHz DC-coupled and 40Hz to 3GHz AC coupled fiber optic links for signal transmission and EM immunity and/or isolation. From Senis, single and three-axis analog Hall probes in a wide range of geometries. Also from Senis, the NV1 Nanovoltmeter, suitable for stretched wire and rotating coil output measurements, particularly for fringe field end-effects. Tom Delaviere from Bergoz Instrumentation will be with Brian Richter from GMW. Philip Keller from Metrolab will be showing their range of NMR and Hall Measurement Instrumentation as well as Precision Digital Integrators in the adjacent booth. Both new NMR and Hall arrays for precision mapping will be shown. If you are in Vancouver, we hope to see you at IPAC18. February 2018: GMW is exhibiting Electromagnet Systems and Magnetic Field Instrumentation at APS March Meeting, Los Angeles, March 5-9. Booth 827 GMW will be at Booth 827 at the American Physical Society (APS) March Meeting. For details, please see: https://www.aps.org/meetings/march/about.cfm The Exhibition Hall is open Monday Evening March 5th at 6:45pm for a Welcome Reception and all day Tuesday to Thursday. GMW will feature: GMW Resistive Electromagnet Systems for spintronics, biological studies, thin films, magnetic materials, and magnetic devices. Model 5405 Electromagnet, has the same dimensions and weight of the Model 5403. This C-Frame electromagnet can reach 2T at 2cm gap with 6kW-rated coils. The BPS-85-70 [pdf brochure] from IECO is 6kW true bipolar power supply, with parallel operation possible for up to +/-140A excitation. When matched with the Model 5405, B-H loops of +/-2.6T over 1cm gap are possible at ~1Hz operation. GMW projected field electromagnets, available as optimized for parallel or perpendicular field. The new model 5207 [pdf brochure] provides fields of over 1T vertical field at 5mm above pole face with single 1kW bipolar supply. The Model 5204 is true vector magnet, with ability to generate fields in any direction above top surface of the magnet at frequencies to 200Hz. Model 3480 Electromagnet, has the same dimensions and weight as the well-known GMW Model 3470 table-top electromagnet. Through higher current density coils and shaped poles, the 3480 can reach fields of over 2T at a 1cm gap. Customized poles for EPR, MOKE and customer-specified geometries are possible. GMW will have the Model 3480-OG, designed to allow for 60 degree incident angles over 1cm gap, on the booth for display. Model 3470HFAC dipole electromagnet generating ±70mT peak fields from dc to 25kHz in an air gap of 35mm. Bartington HCx-3, three-axis Helmholtz Coils with fields to +/-1mT on each axis and frequencies to 5kHz. The MAG-13 series reference magnetometers and field cancellation software allow for applications requiring cancelling of background fields, including at AC Mains power frequencies. HTS-110, manufacturers of High Tc Superconducting Magnet systems, will be in booth 106. Dr. Taotao Huang, Magnet Design Engineer at HTS-110, will on the HTS-110 stand. Magnetic Field Measurement Instrumentation Senis Hall effect Magnetic Field Transducers, Instruments and Mapping Systems with one- and threecomponent Integrated Field Sensors available in field ranges to 20T and frequency response from dc to 75kHz. These are particularly appropriate for very high position resolution field mapping of magnets and magnet arrays. Very small probe package geometries are available. We will have on the stand the new 3MTS digital Hall probe from Senis. The 3MTS is an ultra-compact (less than 1mm thick), three-axis probe with USB output and +/-1% accuracy, all while fitting comfortably in the palm of one’s hand. Mr. Brian Richter, GMW President, Dr. Tom King, Lead Magnet Scientist, and Mr. Lalo Guitron, GMW Sr. VP of Operations, will be available for detailed technical discussions and applications support. If you are in Los Angeles, please stop by. February 2018: GMW is exhibiting at Magnetics and Motor & Drive Systems Conferences, Orlando, FL, Feb 8-9, 2018; Booth 207 GMW is exhibiting at Magnetics and Motor & Drive Systems Confeerences in Orlando, FL. The latest economic developments and technical advancements in magnetics markets and technologies, along with the latest technical advancements impacting the design and integration of motor, drive systems and motion control for manufacturing, industrial and packaging, automotive/EV applications bring together worldwide experts. GMW and its partners will be giving several related Magnetics and Motors & Drives presentations:

Dr Zhen Xu of GMW will discuss magnetic field maps utilizing the Senis Mapper at GMW Rocco Holzhey of Innovent will show a new system for the fast characterization of permanent magnet rotors using an array of three-component magnetic field point sensors and magneto-optic area field sensors. Philip Keller of Metrolab will be building Magnetic Field Mapper with LEGO Matthias Schmidt of Matesy will present an extension of the Matesy “M-Axis” sensor array concept to larger magnets for the calculation of magnetic moments. Read More on Magnetics.. Read More on Motor and Drive.. January 2018: Senis, Newsletter January 2018 Senis introduces new 3MTS hand-held 3-axis Teslameter / Gaussmeter and new calibration tools and analysis software for 3-axis Magnetic Field Mapping systems

Read More.. October 2017: New developments in GMW dipole electromagnets GMW is continuing to update its electromagnet product offering and is pleased to announce the new 5405. This magnet is a direct fit, form and function upgrade for the earlier 5403 system with identical poles, mounting holes and weight. The 5405 offers significant increase in field strength above the 5403; across a gap of 20mm the 5405 generates continuous 2T with the 5403 generating 1.6T. The 5405 provides a peak continuous field of 4.3 Tesla across a gap of 2mm. The 5405 has been optimized to operate in conjunction with an +/-85V, +/-70A true Bipolar power supply. When coupled with this supply the 5405 will operate up to 70A. When operated with a unipolar power supply the 5405 can operate up to 100A for short periods. The 5405 is designed with many options and configurations. A standard range of brackets allow the magnet to be oriented to provide magnetic field horizontally, vertically, at 45° or any orientation as a custom option. The design also allows for the yoke to be split allowing for elongation of the magnet at 25mm intervals, it is very simple to modify the magnet to fit around any working environment. The magnet is protected by a temperature interlock that removes power in the event of over-temperature. A further safety option includes a water flow switch that can be included in the interlock circuit. Yellow alert status can also be included by an additional water flow meter to indicate when maintenance is required. Similarly, a temperature based yellow alert can be added to show that the magnet is operating warmer than usual but within acceptable range; indicating maintenance is required. Preliminary Specifciations: 5405 Brochure, October 2017

September 2017: High-Temperature Fluxgate Magnetic Field Sensors and Metrology-grade Helmholtz Coils from Bartington Instruments GMW Associates and Bartington Instruments would like to update you on the latest product development in area of magnetic field generation, measurement and control for fields to 20G and frequencies from DC to 12kHz. For more information please click here

August 2017: GMW is Exhibiting at the Electric & Hybrid Vehicle Technology Conference, Novi, MI, Sept 12-14, 2017; Booth 826 GMW will be showing Sensors and Instruments for magnetic and electrical measurements used in motor and battery development and test. For more information please click here

August 2017: GMW & Bergoz Instrumentation at IBIC, Grand Rapids, MI Aug 20-24 GMW will again be exhibiting at the upcoming International Beam Instrumentation Conference (IBIC), hosted by FRIB and held in Grand Rapids, MI at the Amway Grand Hotel and Conference Center. The Conference opens with a Sunday evening reception, with exhibition stands open from Monday through Wednesday afternoon. For more infrormation please click here

August 2017: Compact HTS Magnets for Neutron Scattering Sample Environments Since establishment in 2004, HTS-110 successfully designed and manufactured many challenging magnet systems around the world, using HTS technology. For more infrormation please click here

August 2017: GMW is exhibiting at The 2017 Symposium on Electromagnetic Compatibility, Signal and Power Integrity, Washington, DC. August 7-11 For more infrormation please click here

June 2017: Fermilab 50th Anniversary Symposium & June 8th Annual Users Meeting GMW will be participating in Fermilab’s 50th Anniversary Symposium and Users Meeting next week. The Symposium is June 7th and Users Meeting is June 8th. For details, see:

50.fnal.gov/50years/agenda/ Read more > May 2017: High Speed, High Resolution Magnetic Field Mapping System The SENIS Magnetic Field Mapper can map dc and ac magnetic fields associated with permanent magnets and electromagnets.

Read more > May 2017: Senis, Newsletter May 2017 SENIS AG provides magnetometers, mappers, current sensors and corresponding services .

Read more > April 2017: GMW is exhibiting at ISMRM, Honolulu, April 22-27, Booth 411 GMW is at Exhibiting at Booth 411 of the 25th Annual Meeting of the International Society for Magnetic Resonance in Medicine (ISMRM).

Read More.. Eddy Current Detection of Mechanical Faults in Permanent Magnets and in Magnet Blanks Prior to Magnetization Check out the latest article published in "Magnetics Business & Technology Magazine" here

March 2017: AKM, VAC, DaniSense, PEM and GMW Current Sensors and Probes at APEC, Tampa, FL The IEEE Applied Power Electronics Conference, APEC, is in Tampa, FL, March 26 to 30. Complimentary registration for the Exhibit Hall is available. For details please see here:

Read More.. March 2017: Working at low temperatures? Learn how GMW magnets can be integrated into a closed-cycle optical cryostat. Montana Instruments will be exhibitiing at APS March meeting, booth # 428.

Read More.. March 2017: GMW is Exhibiting at APS March Meeting, New Orleans, LA, March 13-17 GMW will be at Booth 535 at the American Physical Society (APS) March Meeting . The Exhibition Hall is open Monday Evening for a Welcome Reception and all day Tuesday to Thursday. Late afternoon wine and cheese receptions will be in the Exhibit Hall Tuesday and Wednesday.

Read More.. GMW CPC Clip-On DC/AC Current Probes with Current ranges to +/-2000A The GMW CPC-XXXX-27 Clip-On, DC/AC Current Probe with 27mm aperture is now available with delivery from stock. Full-scale current ranges are: ±250A ±500A, ±1000A, or ±2000A.

Read More.. February 2017: GMW 3480 Electromagnet Systems for FMR Spectroscopy and EPR Measurements GMW recently released the 3480 Electromagnet, which is a fit, form and function replacement for our popular 3470 Electromagnet but with greatly improved performance.

Read More.. January 2017: Presentations Magnetics 2017 GMW was at Magnetics 2017 in Orlando, FL. The latest economic developments and technical advancements in magnetics markets and technologies were brought together by the magnetics experts.

Eddy Current Matesy

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Metrolab

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Innovent

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November 2016:History of PEM Rogowski Coil AC Current Probes Dr. Chris Hewson, CEO of Power Electronic Measurements (PEM) reviews the history of PEM Rogowski Coil AC Current Probes in EE Power Magazine. Read more >

October 2016: GMW introduces 3480 bench-top lab magnet GMW introduces the 3480 ( specifications ) bench-top electromagnet as a switch-in upgrade to our long standing 3470 portable electromagnet. The 3480 is the same size (285mm W x 197mm D x 213mm H) and weight (32kg) as the 3470 and uses the same mounting fixtures. The 3480 also has mounting fixtures for both metric and imperial optical tables. The new 3480 provides nearly twice the field across most pole gaps (>3.6T at 2mm gap, >2.0T at 10mm gap). Electrical connection to the 3480 can be made in three different configurations allowing the magnet to be matched to a wide range of power supplies.

GMW offers modifications and customizations to all electromagnets in the GMW product range. We can modify standard poles with axial holes for optical access and custom pole shaping for ease-of-access. Additionally, pole tips and caps can be added for custom field profiles, such as maximum field at a single point or a uniform field over a larger area/volume. Yoke geometry can also be modified for increased access. Such customization allow for ease of integration and increased magnetic field performance. Examples include integration into vacuum systems, high field uniformity for EPR applications and access bores for samples or instrumentation.

GMW 3480 Lab Magnet Specifications

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August 2016: Metrolab launches the PT-2026 NMR Teslameter (Gaussmeters) GMW is pleased to announce the PT-2026 NMR Teslameter (Gaussmeters) from Metrolab Technology, the successor to the industry standard PT-2025. Probes are presently available for fields from 0.19T to 22.8T. Details can be seen at:

http://www.gmw.com/magnetic_measurements/MetroLab/PT-2026.html The PT-2026 allows for measurements with significantly improved resolution than the PT-2025. The PT2026’s precision is due both to a pulsed-wave (PW) NMR detector and to advanced signal processing. Improved resolution is achieved by eliminating deuterium samples for fields below 12T. At 3T fields, resolution of the PT-2026 with proton 1226 series probe is over 100x better than that of the 2025 with 1062-6 deuterium probe. Even with proton probes, the 2026 is over 10x better at 1.5T. This improvement will allow for shorter measurement periods for magnet field decay measurements for MRI – all with a single probe capable of measuring at both 1.5T and 3T. An integrated 3-axis hall sensor mounted in the probe head allows for faster locking by nearly a factor of ten, limiting the (relatively slow, compared to Hall effect) NMR search to fields very close to field of interest rather than the entire range of the probe. The PT-2026 allows measurement accuracy resolution to be traded off against measurement speed, and allows measurement rates of up to 33 Hz, instead of the PT-2025’s 1 Hz. Additionally, the PT-2026 can measure in fields with roughly twice the inhomogeneity as the PT-2025. The PT-2026 provides USB and Ethernet interfaces, and supports the industry-standard USBTMC/USB488 and VXI-11 protocols. LabVIEW Drivers are included, allowing for customization of applications. The PT-2026’s trigger-in capability allows for triggering a magnetic-field measurement at a precise moment in time. Alternatively, trigger-out allows triggering of another instrument when the field reaches a given value.

June 2016: GMW Extends AC Electromagnet Capabilities with 3470HFAC High Frequency AC Magnet GMW magnets are designed for DC operation and AC operation up to a few Hz and have been operated up to tens of Hz. GMW is now offering the higher frequency 3470HFAC system which operates up to 30 kHz. This new system is configured as a C-frame dipole and delivers field up to 70mT across a 35mm pole gap. The system has been used for neutron studies, and is also suited for Fine Particle studies . Full specifications can be found on the 3470HFAC

Preliminary Datasheet (pdf). GMW has also extended its line of projected field magnets, offering the original 5201 in-plane magnet, the 5203 projected vertical (perpendicular) field, 5205 vertical (perpendicular) field large area, low profile magnet, and 5204 (pdf) projected 3-axis vector magnet to be completed late 2016. This complementary family of magnets serves many areas of spin dynamics whether the architecture is based on in-plane or out-of-plane spin, or if an AC or rotating field is required. Peak fields range from ±300mT for 5204 to ±0.8T for 5203. All 520x models allow for customized poles or pole tips to optimize peak field vs. uniform field area or for field shaping. 5204 is being offered as a central tool for FMR studies as it can provide both the DC bias field and the AC sweep with both the DC and AC components oriented in any direction. For higher projected fields to >2T, GMW offers a Projected Field High Temperature Superconducting magnet (pdf) from HTS-110. Additional magnets from HTS-110 include low-profile (height < 35mm) solenoids to ±3T, high-field large bore (54mm) solenoids to ±14T, and fast-ramp (360s + 40s dwell over 4 quadrants) dipole magnets to ±8T.

May 2016: GMW is at SpaceTech/Aerospace Engineering, May 24-26 in Pasadena, CA GMW is in booth 1012 at the combined Space Tech and Aerospace Electrical Systems Expo. For more information, see:

http://www.spacetechexpo.com/ and http://www.aesexpo.com/. Note that complimentary registration for free sessions and Expo is available from either link. The Expo moves this year to The Pasadena Convention Center in downtown Pasadena, opening on Tuesday the 24th at Noon and running through Thursday afternoon. GMW will be showing instrumentation for measurement and mapping of magnetic fields and calibration of magnetic sensors.

Specifications: Bartington Instruments Magnetic Field Sensors single-axis or three-axis, with versions for very low noise, very low power, room temperature or cryogenic operation, and laboratory or harsh environments with full-scale field ranges to 2mT (20G) and frequency response from dc to 12kHz. Details on the SpaceMag Lite, designed for use in CubeSat Missions, will be available. Bartington Instruments Helmholtz Coil Systems in One- to Three-Axis geometries with very high angular orthogonality. The coils generate magnetic fields for high accuracy magnetic sensor calibration or active field cancellation. The three field components, Bx, By and Bz, are controllable to 500uT (5G) dc or 100uT (1G) to 5kHz. The HC1-3, Three-Axis Coil with approximately 0.5m Coil diameter will be shown. Metrolab Three-Axis Magnetic Field Probes with a USB interface for direct connection to a laptop or tablet with USB Port. A fluxgate version, TFM1186, is offered for low field measurements to ±100uT (±1G) and higher field versions have full-scale ranges of ±8mT, ±3T and ±20T. The TFM1186 has been approved for use aboard the International Space Station (ISS) for magnetic surveys. GMW will have details on the new PPM Sentinel 3 Fiber-Optic Link system specifically designed for aircraft test. With touch screen monitoring and capability to link up to 288 channels into single 19” rack-mounting chassis, the Sentinel 3 is ideal for NEMP testing (MIL-STD 188-125) as well as Low Level Swept Field and Low Level Swept Current tests. Transmit heads are electrically shielded to 100kV/m, well-suited for Full Threat Environments. GMW will also be showing instrumentation for the measurement of current in electric power conversion systems.

PEM Rogowski Coil AC Current Probes for ac current measurements with frequency response to over 30MHz and full-scale currents to over 300kA. Convenient, “clip-around” coils are available with crosssection as small as 1.8mm that can be used for current measurements on high speed power devices. DaniSense Current Transducers are very high accuracy, low noise, fluxgate current transducers, ideal as current range extenders for power analyzers or high accuracy, low noise dc and ac current sources or loads. Current ranges from ±300A to ±8000A peak are available. Frequency response is to over 500kHz (-3dB) and each transducer is factory characterized for amplitude and phase response. GMW DC-AC Clamp-on Current Probes offer full-scale currents from ±500A to ±16kA and frequency response from dc to 40kHz. These slim and low mass Current Probes can be easily installed to enable quick diagnostic measurements in dc/ac high current systems where cable disconnection is difficult or impossible. If you are at Space Tech or Aerospace Electrical Systems please stop by. Thank you, Brian Richter President, GMW Associates

March 2016: Bartington Newsletter Bartingon Instruments is launching two new OEM products: the Mag646 single axis sensor and the Mag651 low power three-axis sensor .

Download the Newsletter January 2016: New Magnets from GMW: High Frequency and High Field GMW is introducing some new electromagnets for research and development applications. From HTS-110, we are now offering a 2T Vertical Projected Field Electromagnet, made from High Tc superconducting wire. This adds to the existing line of the GMW Projected Field Copper wire Electromagnets, the series 520x. This magnet offers a ±2.3T field at vertical distance of 5mm above the top surface of the magnet. Uniformity over a 10mm disc at this height is 0.5%. The magnet runs off a standard commercial bipolar power supply and with an iron return, the 5G fringe field is less than 0.5m from the magnet. Cooling is via a commercial closed-circuit cryocooler. Also from HTS-110, the line of LM Short Solenoids. Standard, room-temperature bores range from 40mm to 80m and fields from ±1T to ±3T. These low-profile solenoids feature heights of 45mm to 160mm and field uniformities down to 0.05%. All coils operate at 125A, allowing for use of 1kW bipolar power supply. The high fields in relatively short profiles allow use with compact cryostats and microscopes in beam focusing applications. GMW is developing a high frequency version of the long lived 3470 tabletop dipole. Using exotic materials for the core and Litz wire coils, the 3470HFAC (High Frequency AC) operates at frequencies from dc to 25kHz using commercial amplifiers. DC fields are to ±90mT. At 25kHz frequency, peak fields of 20mT are obtainable at an air gap of 35mm. Although this magnet has been designed for small angle scattering of neutrons, we anticipate materials and biological applications.

Specifications: HTS-110 2T Vertical Projected Field Electromagnet, Technical Information , 1.3MB HTS-110 LM Short Solenoids, Technical Information , 1.5MB GMW 3470HFAC (High Frequency AC) Electromagnet, Technical Information , 668kB January 2016: New High Temperature and Low Noise Bartington Three-Axis Fluxgate Magnetic Field Sensors from GMW Bartington Instruments has released several high resolution 3-axis fluxgate magnetic sensors over the past year. The MAG-13 is the next generation of 3-axis fluxgates, adding to the low noise MAG-03 line. The MAG-13 features a common origin for the three field components to improve mapping and calculation accuracy. The MAG-13 also the “z” range of ultra-low noise, <4pTrms/√Hz for the 1G and 0.6G ranges. A deep submersible version able to withstand depths of 5km (IP68 enclosure) has been delivered and tested. The MAG-13MSL100 can be also be offered with NPL-certified calibration, allowing its use for metrology applications. The MAG-13MSL100 also serves as the reference fluxgate for Bartington Triaxial Helmholtz Coil systems, with HC13 (0.5m inner diameter) and HC2-3 (1m inner diameter) systems available as standard. The complete system of coils, PA1 amplifier and CU1 control unit, allows for fluxgate or other sensor calibration at DC (to +/-5G on each axis) and to frequencies as high as 5kHz (+/-1G on each axis). The system features very high orthogonality of better than 0.05 degree through electronic adjustment to enable precise multi-axis measurements of compass chips and other sensors. The larger coils can accommodate a 3U CubeSat satellite for in-situ calibration for satellite applications. Bartington has also expanded their high temperature fluxgates to single, two and three axis sensors with operating temperature options of 185°C and 215°C. A low profile sensor, Model 614, has 25 x 20mm footprint and 10mm height, allowing direct PCB mounting in directional drill heads. Several noise level options are available for the Model 614.

December 2015: Systems for Visualizing and Mapping Magnetic Fields in Space and Time Magneto-Optic Sensors and Sensor Systems from Matesy utilize the rotation of polarized light in the Sensor to enable the magnetic field distribution external to a flat surface to be captured. Complex static magnetic field patterns from permanent magnets in linear or disc encoders, magnetic codes, or magnetic actuators can be rapidly imaged for product design, magnetizer tool development or quality control of magnet production by placing the object on the Sensor surface. Areas of up to 75 mm diameter are available with a single Sensor. Magneto-Optic Sensors are presently available in four magnetic field ranges of ±2.5mT to ±160mT full-scale with a ±300mT Sensor presently in development. Field amplitude resolution is approximately ±1% of full-scale with an accuracy of about ±5% of full-scale. The spatial and time resolution Matesy Magneto-Optic Systems are dependent on the optical system, camera and image processing. In the standard CMOS-MagView system, resolution can be down to 25 µm and 1 sec respectively. In video mode it is feasible to continuously image time varying magnetic patterns such as created by grain boundary movement in magnetic steels as a function of imposed external field or the movement of magnetic fluids in micro-machined channels. Field amplitude versus position can be displayed as a 3-D image of B versus x and y position, or as B along a selected line in the x-y plane. An overview of applications to date is available here . Senis offer their high accuracy Three-Axis Magnetic Field Transducers in Magnetic Field Mapping Systems. These Transducers are based on a Senis Field Sensor Integrated Circuit that simultaneously measures Bx, By and Bz within a measuring volume of 150 x 10 x 150 µm to provide high spatial and angular resolution. The Mappers provide x-, y-, z- motion control of the Field Sensor over a 135mm or 500mm cubical volume. Position location resolution can be 10 µm or 1 µm with scanning speeds of 50mm/sec or 100mm/sec. A Rotating Stage is available as an option. Standard field ranges are available from ±20 mT to ±T full scale and multiple ranges are available as options. Measurement accuracy for each component of Bx, By, and Bz is ±0.5% or ±0.1% of full-scale with a frequency response from dc to 2.5 kHz (-3dB) as standard and 25 kHz optional. A Touch Sensor Probe Mounting option immediately stops the mapping in the event the Probe touches an obstacle. A Position Calibration Tool enables accurate calibration of the Probe magnetic center with respect to mechanical axes. Unique options include a Sliding Probe that touches the surface to be mapped and enables accurate field mapping to within 100 µm of the surface.

December 2015: GMW Extends Project Field Electromagnet Capabilities GMW has extended its range of projected field electromagnets to include higher fields, larger working areas and lower profile. The original 5201 projected field in-plane magnet is joined by the model 5203 projected vertical field

magnet. This complementary pair serves many areas of spin dynamics whether the architecture is based on in-plane or out-of-plane spin. The 5203 allows for the easy extraction of the central pole and replacement with either a standard pole option or a customized pole solution. Fields up to 0.8T are achievable with Type D poles while field uniformity better than ±1% over a Ø5mm area can be achieved with a Type A pole. GMW now offers customized pole tip options for the model 5201 upon request. A large test area option is now available in the model 5205 projected field magnet. Providing vertical fields up to 100mT, this magnet meets the important requirement that it is rated to operate continuously at temperatures up to 150°C. A variety of pole options are available for this magnet which allow for the selection of peak field, field uniformity and the elimination of radial field for areas up to Ø20mm. The latest offering is the 5204 projected vector magnet. This magnet offers field of any orientation over a working volume of 1mm^3 located 5mm above the top surface of the magnet. Arbitrary field profiles that vary in spatial orientation and time are available allowing for the collection of previously unavailable data. GMW has also extended its range of uniform field magnets. The original models 5451 and 5452 Helmholtz magnets are now extended to the model 5453 Shielded Helmholtz electromagnet. This magnet provides higher field (0.25T) and improved uniformity (<100ppm over 40mm DSV). The magnet incorporates a magnetic circuit which protects the inner working volume from external fields while minimizing external fringe field.

November 2015: Article: The Future of NMR Magnetometry. Our partner, Metrolab, writes about the challenges ahead in NMR Magnetometry. Read the article in Magnetics

Technology International August 2015: Magneto-Optic Films From Matesy New Product Line: Magneto-Optic Films From Matesy. Matesy magneto-optic films allow real time visualization of magnetic fields. For more information, click here

December 2014: Bartington Newsletter New magnetic field probe for customer-designed elctonics. 1 metre Helmholtz Coil now available and real world application updates.

Download the Newsletter October 2014: Senis Field Mapper Video The High-end All-in-One Magnetic Field Scanning System SENIS MMS-1A-RS enables a user to quickly map the magnetic field around an permanent magnet or electromagnet with highest resolution and accuracy.

Watch Video Directly. September 2014: Senis Newsletter Overview of ManaChip Semiconductor and Senis sign patent Licence agreement. Senis at IEEE 29th International Conference on Microelectronics(MIEL 2014) and other conferences

Download the Newsletter July 2014: Senis Magnetic Field Measurement Catalog New products: Probes as thin as 0.25mm, Next-Generation Magnetic Field Mapper, Defectoscope for crack detection. Download the newsletter > June 2014: Bartington Newsletter Mag566 launched in satellite for attitude sensing and VLF wave measurement; New high temperature probes up to 175°C; Compact Sensors for Security Applications. Download the newsletter > May 2014: Powerguru Article Next Generation Current Probes for High Speed Power Density Appliations. Read Article March 2014: Bartington Newsletter 1-metre Helmholtz Coil under development and Price Changes. Download the newsletter > April 2014: Senis Newsletter Senis conference schedule update. Download the Newsletter > Mar 2014: GMW features current measurement instruments and sensors at APEC, Fort Worth, TX The Applied Power Electronics Conference, APEC, is in Fort Worth, Texas, March 16-20, 2014. For details please see: http://www.apec-conf.org/ Note that Exhibit Only Registration is available at No Charge. Please see: http://www.apec-conf.org/registration/registration-rates/ GMW is at Booth 606 and will present Instruments and Sensors for the voltage isolated measurement of electric current: From DaniSense: DC/AC Current Transducers with full-scale current ranges of 300A, 900A and 3000A and primary/signal current ratios of 500:1 to 1500:1. New zero-flux, closed-loop design gives improved amplitude and phase accuracy for demanding applications like current range extension for power analyzers or current feedback in low noise, high precision power supplies and amplifiers. Each Transducer is provided with the Factory Calibration measurement of amplitude and phase response versus frequency to 300kHz. Options include current or voltage signal output, and calibration winding. Henrik Elbaek, CEO of DaniSense, will be at the GMW Booth. From Power Electronic Measurements (PEM): Rogowski AC Current Probes with matching Integrator in a wide range of Coil cross-sections and lengths. Very thin Coils are appropriate for isolated current measurements to 6kA peak and 30MHz on the leads of power devices. Larger Coils are available in current ranges to 1MA and Coil lengths to many meters to provide signal inputs to waveform and power analyzers. Options are available for three phase measurement, instantaneous or rms output, voltage or 4 – 20mA signal. Modified versions are available for specialized applications such as 13.56 MHz industrial rf current monitoring. Dr Chris Hewson, President of PEM, and Joanne Aberdeen, Director of Engineering, will be supporting the PEM products. From Magnelab: Passive Current Transformers (CT) with high sensitivity to 5V/A and high frequency to 500MHz for demanding pulse and cw rf current measurements. From GMW: Slip-On and Clamp-On Current Probes to provide convenient, reliable DC/AC high current monitoring to 16kA in high magnetic field environments such as electrochemical and electrowinning applications. Analog and wireless output options. From Senis: High sensitivity pcb mounting Current Sensors with full-scale ranges from 0.25A to 10A for current present monitoring or use with sensing resistors for isolated high voltage measurement. Compact Multichannel Current Monitors with DIN Rail or panel mounting with full scale ranges to 50A for condition monitoring of electric heaters, lamps and motors. We will have Nebojsa Radosevic from Senis at the GMW Booth. From AKM: Miniature pcb mounting current sensors to 80A fs with very low noise and dc to over 400kHz frequency response for linear and high frequency pwm power converters and motor drives. Low noise Linear Hall IC for current and position sensing. Lou Law and Eric Mueller will also be with me at the GMW Booth. If you are attending APEC, please stop by. Thank you. Best wishes, Ian J. Walker VP Engineering, GMW Associates Nov 2013: Senis Newsletter Ceramic hall probes as thin as 0.5mm; High Frequency Hall Probes up to 0.5MHz. Download the Newsletter > Nov 2013: Metrolab: Measuring Magnetic Field Transients High resolution, fast digital integrator (FDI) for measuring magnetic flux. Published in Magnetics Technology International. Author: Phillip Keller, Metrolab Technology SA Full Magazine, Magnetics Technology International, 2013 Annual> Measuring Magnetic Field Transients (article only, PDF)> Prior Metrolab Articles in Magnetics Technology International Recent Advances in Hall Magnetometers, 2012 Annual (article only, PDF)> NMR Magnetometers, 2011 Annual (article only, PDF)>



Oct 2013: Bartington Newsletter Mag-13 Fluxgate Magnetometers; Helmholtz Coil System; Gradiometry site survey locates Roman villa. Download the Newsletter > June 2013: Danfysik Newsletter Danfysik Green Magnet Accelerator Magnets; MW Range Power Supplies for ISIS and INFH. Download the Newsletter > May 2013: Senis Newsletter Digital Teslameter (Gaussmeter) with 1ppm resolution and 0.001% accuracy; SENIS at Sensor + Test in Nurnberg, Germany and CWIEME in Berlin, Germany. Download the Newsletter > February 2013: Bartington Newsletter Bartington Collaboration with Metrolab Teslameters (Gaussmeters); New Digital 3-axis Gradiometer; New Degaussing Wand and Magnetic Shields; Magnetic Susceptibility in Banknote Security Download the Newsletter > October 2012: Metrolab Developments in Hand-Held Magnetic Field Measurement Recent developments expand range of hand-held 3-axis magnetic field measurement from nanotesla to 14 Tesla. Published in Magnetics Magazine. Author: Phillip Keller, Metrolab Technology SA. Read Full Article > September 2012: Bartington Newsletter New 3-Axis Helmholtz Coil System; Down-Hole Magnetic Susceptibility Measurement; Autonomous Underwater Navigation via Magnetic Anamolies. Download the Newsletter > May 2012: Bartington Newsletter New Low-Noise Magnetometer (Mag628), Earthquake Prediction, Magnetic Susceptibility in Forensics. Download the Newsletter > January 2012: Bartington Newsletter New Fluxgate Magnetometer products (Spacemag, Mag634), MS2/MS3 for QC and more. Download the Newsletter > November, 2011: GMW ISO 9001:2008 Certification GMW Associates is proud to announce achievement of ISO 9001:2008 Certification. Certification was conducted by Perry Johnson Registrars, whose accreditations include UNAB (ANSI-ASQ National Accreditation Board) and UKAS (United Kingdom Accreditation Service). ISO 9001:2008 Certification is an internationally recognized set of standards for quality assurance, quality management and continuous improvement. The standards represent best practices, policies and procedures to ensure that GMW will continue to consistently meet our customers' needs for superior products and technical support. . Download the Certificate > September, 2011: Bartington Newsletter New Fluxgate Magnetometer prodcuts, updates to Bartsoft for MS2/MS3 Magnetic Susceptibility Meter and more. Download the Newsletter > April, 2011: AKM Magnetic Sensors 2011 Product Guide New product guide. AKM (Formerly Asahi) has a new guide to their magnetic sensors product range, covering Hall Elements, Hall Switch ICs, Hall Two Axis IC, Hall Arrays and Semiconductor Magneto Resistive Sensors. Download the Guide > December, 2010: LEM Current and Voltage Transducers As well as the LEM IT series of Current Transducers and Instruments, originally developed by Danfysik ACP Division, GMW is now stocking selected LEM Hall Current Transducers for test and measurement applications. These are appropriate for production testing of electrical appliances, motors and vehicles where the very high accuracy of the IT series is not necessary but ohmic isolation and high reliability are crucial. With the addition of LEM Voltage Transducers covering 500V to 6000V and frequencies from DC to over 100kHz for lower voltage units, GMW can now offer the capabilityto convert high level current and voltage to isolated low level signals for product performance and/or power test and measurement. June, 2010: Asahi Magnetic Sensors Asahi have a new summary of their magnetic sensor product range covering Hall elements, Hall Switch IC, Hall Linear IC, Hall Two Axis IC, Hall Arrays and Semiconductor Magneto Resistive Sensors. Applications include non-contact sensing of proximity, linear position, angle position, rotation, and electric current. Please contact GMW for applications engineering support. Download the Brochure > October, 2009: Asahi EM-3242 Magnetic Angle Sensor The Asahi EM-3242 is a very small, 6 pin, SOIC IC which enables non-contact, low wear, full 360°, angle sensing utilizing a simple two pole magnet. Operation is from a nominal 3V source with a ratio metric, analog output of 0.3V to 2.7V. Power draw is 8mA in wake mode and 1µA in sleep mode. Contact GMW for Engineering Kits and support to apply the EM-3242 to remote readout of valve, arm, vane and meter position; gas and fluid metering; non-contact operator controls; or servo position control. More > May 18, 2007: GMW introduces new magnetic field sensors products at Sensors Expo At Sensors Expo, June 11-13, 2007 Rosemont, IL, Booth 406, GMW will be showing magnetic field sensors that are particularly suited for non-contact measurement of: Machine Condition: The Ametes MFS-3A is a high-sensitivity, three-axis, Magnetic Field Sensor with linear analog outputs for Bx, By, and Bz. With a bandwidth if dc to 100kHz, the MFS-3A can be located outside electric motors, generators, transformers, or actuators to monitor the external magnetic field magnitude and or frequency components. These parameters will change with electrical or mechanical loading to give an isolated, non-contact indication of the “machine condition” in a manner analogous to vibration monitoring of rotating machinery. Electric Current: The Sentron CSA-1V is a high-sensitivity, high-stability, linear Hall-effect IC with magnetic field sensitivity in the plane of the device and frequency response dc to 100kHz. These features enable the CSA-1V to be used as a compact, low cost current sensor, particularly for circuit protection applications. It can be mounted directly over a current trace on a PCB or on the surface of a high current bus bar. GMW offer Engineering Kits to cover full-scale current range from 250mA to 4000A Ametes CS Current Sensors are available with high-sensitivities of 10V/A, 1V/A, and 0.25V/A. High voltage isolation of 5kV is achieved by mounting the CSA-1V to measure the magnetic field inside a small coil carrying the primary current. Rotation Angle: With no programming and no calibration requirement the Asahi Kasei EM3241 provides a linear, analog output directly related to the angle of the magnetic field in the plane of the device. High magnetic sensitivity field sensitivity enables the use of small, low-cost permanent magnets for angle sensor or rotation sensing with better than 0.7° angle resolution over a full 360° at rotation speeds well in excess of 200Hz (12000rpm). Very small size (3.6 x 3.0 x 0.95mm) and a low-power sleep mode (<1µA) suggest the EM2341 will enable new portable and wireless applications. Top of Page April 28, 2006: Spallation Neutron Source, located at Oak Ridge National Laboratory, generated its first neutrons. One of the largest and most anticipated U.S. science construction projects of the past several decades has passed its most significant performance test. The Department of Energy's Spallation Neutron Source, located at Oak Ridge National Laboratory, generated its first neutrons on April 28, 2006. GMW has supplied SNS with instrumentation including: Group3 Control system and Bergoz Fast Current Transformers for use in the Front-End Systems; Bergoz Fast Current Transformers and Low Level RF analog front end for use in the Linac; Danfysik Magnet Power Supplies for use in the Accumulator Ring; and Danfysik Power Supplies, Danfysik Current Transducers, and Group3 Digital Teslameters (Gaussmeters) for magnet system test. Top of Page June 6, 2005: GMW introduced new Angle Sensor products at the Sensors Expo in Chicago GMW introduced new Angle Sensor products at the Sensors Expo in Chicago, June 6-8, 2005. When paired with the Sentron 2SA-10 Angle Sensor IC the GMW360A Sin/Cos to Analog Interpolator IC provides linear 0.4V to 4.5V and PWM signals proportional to angle over the 0 to 360degree range. An electrical "Zero Angle" can be set at any mechanical position after system assembly. Top of Page May 27, 2005: The AN_360KIT Application Engineering Kit is available for test and evaluation The AN_360KIT Application Engineering Kit is available for test and evaluation. A combination of the 2SA10 and GMW360A is offered as the GMW360ASM Angle Sensor Module. This is a cylindrical package of 0.5inch diameter by 0.2inch height (12.70 x 5.08mm). A single 5V supply is required with no other external components. Top of Page March 21, 2004: GMW introduces the Model 5751 HTS Short Solenoid As an extension to it's Laboratory Electromagnet product line GMW introduced the Model 5751 HTS Short Solenoid at the APS (American Physical Society) Meeting in Los Angeles, California. With a 35mm diameter by 72mm long, room temperature bore the 5751 generates controllable magnetic fields between ±1Tesla (+/-10,000Gauss). This is 5 to 10 times the field readily generated by a similar size copper coil and is obtained by using a Coil wound with HTS (High Temperature Superconducting) wire operated at 50 degK. Priced at $49,000, a complete 5751 System includes the HTS Coil, integral Cryocooler, Compressor for the Cryocooler, Power Supply including polarity reverse and all interconnecting Cables. Top of Page February 9, 2004: Oxford Danfysik to build Beamlines for the UK DIAMOND Synchrotron Oxford Danfysik have been awarded the contract for three complete Protein Crystallography Beamlines for the new DIAMOND synchrotron in the UK. This contract will include design, building and installation of all the main components including adaptive bimorph mirror systems, double crystal monochromators, diagnostics, other standard beamline hardware and an EPICS control system. This contract will be installed in summer 2005. Top of Page January 20, 2004: The Institute of Physics announce the publication of 'Hall Effect Devices' by Prof. R. S. Popovic The Institute of Physics have announced the publication of Hall Effect Devices by Professor R S Popovic of the Swiss Institute of Technology (EPFL) Lausanne, Switzerland. It covers semiconductor physics, operation and applications of Hall devices, including Field-effect and Bipolar types. Professor Popovic is the Founder of Sentron AG, manufacturer of unique Linear Hall Elements and Integrated Circuits and Linear Hall Transducers distributed by GMW. Applications include magnetic field mapping, non-contact position and electric current sensing. Top of Page December 16, 2003: Danfysik awarded contract for Injector Assembly Danfysik has been awarded the turnkey contract for the Injector System of the Australian Synchrotron Radiation Facility at Monash University. Included are: the 100MeV Linac, Transfer Line to the Booster, 3GeV Booster Synchrotron, Transfer Line to the Storage Ring with Injection Septum Magnets, Electromagnets, Power Supplies, Beam Diagnostics and Controls. Top of Page September 25, 2002: Sentron's CSA-1V Current Sensor IC wins a Bronze Medal at Sensors Expo The CSA-1V Hall-effect Integrated Circuit won a Bronze Medal for Sentron at Sensors Expo in Boston. An Integrated Magnetic flux Concentrator (IMC) enhances the CSA-1V magnetic sensitivity to effectively provide lower noise and offset in a CMOS Hall-effect device. Isolated electric current measurement from dc to 100kHz with smaller size, simpler assembly and lower cost than packaged current transducers is anticipated to lead to applications for the CSA-1V to power supplies and motor, generator and power controllers. The CSA-1V is available in SOIC-8 package or 1.9mm square dice form. Top of Page September 18, 2002: Danfysik Booster Accelerator commissioned at CLS The Canadian Light Source (CLS) announced today that the 2.9GeV Electron Synchrotron "Booster" Accelerator has been successfully commissioned in Saskatoon approximately 30 months after the C$8.9M contract was awarded to Danfysik. Beam diagnostic instrumentation for the Booster, including Beam Position Monitors, DC Current Transformer, pulse Fast Current Transformer and Beam Loss Monitors was provided to Danfysik by Bergoz Instrumentation. Danfysik and Bergoz have also delivered equipment for the CLS Storage Ring scheduled for completion in 2003 with operations beginning in 2004. Top of Page March 29, 2002: Bergoz beats the competition Bergoz Instrumentation announced today the award by CERN for 300+ units of their sensitive Fast Current Transformer (FCT). These high performance FCTs are to be installed in critical locations on the Large Hadron Collider (LHC) accelerator as beam diagnostic monitors. The specifications for the Bergoz FCTs include: Mechanical ID = 38mm OD = 72 mm H = 17 mm Turns Ratio Type 2 = 100:1 Type 3 = 35:1 Risetime = 30 nsec Bergoz was selected for superior performance especially for vacuum operations, quality and price. Top of Page GMW Customer, AccSys Technology, announces delivery of PULSAR (TM) Linac for Rome, Italy May 14, 2001 Dr Robert Hamm, President and CEO of AccSys Technology located in Pleasanton, California, announced the completed delivery of a Model-7E PULSAR (TM) Linear Accelerator to Italy. It will be installed in Rome at the Regina Elena Oncological Hospital to produce the F-18 radio-isotope for use in Positron Emission Tomography (PET) medical diagnostic imaging. In the future the Model-7E will be time-shared as the injector for a linac to produce high-energy protons for cancer therapy. As well as extensive operational testing and the demonstration of F-18 production, the Model 7E received the European Union CE Certificate of Compliance from TUV Rheinland. To help meet these demanding performance and reliability requirements combined with an onerous delivery schedule, AccSys implemented a control system based on Group3 Control fiber-optic isolated modules with LabVIEW software and GMW engineering support. Top of Page NMR Probe Array for fast magnetic field mapping March 21, 2001 The Metrolab MFC Magnetic Field Camera from GMW Associates is appropriate for very fast, high accuracy magnetic field mapping of uniform field magnets as used in Magnetic Resonance Imaging (MRI), particle accelerator detectors, ion traps or mass spectrometers. An MFC system consists of an MFC-3045 Control and an MFC-3048 Probe Array configured to the end-user's required geometry. Typically the Array consists of up to 32 proton NMR Probes arranged in a planar array on a semicircle or semi-ellipse. Rotation of the Array about the diameter generates a magnetic field map on the surface of a sphere or ellipsoid. Arrays delivered to date have had diameters of 200 to 600mm. Larger Arrays with up to 96 Probes are possible. All Probes in the Array are monitored simultaneously and a field measurement is obtained in about 30msec. Normally measurements are averaged for about 2 sec. Then the Probe Array is moved to the next measurement position. A complete map of about 960 points (32 Probes x 30 positions) with about 0.3ppm field resolution can be obtained in less than two minutes. Recently a new "flat coil" Probe with integrated rf amplifier has been introduced. This has resulted in improved tracking between Probes and an extension to higher fields. Probe Arrays for 3T fields have been delivered and the design is expected to operate to 7T. Top of Page Danfysik announces 400A DC Current Transducer March 8, 2001 GMW Associates is now offering a new addition to the Danfysik ULTRASTAB Current Transducer product range for ohmically isolated, precision measurement of electric current. Operating on the principle of maintaining zero magnetic flux in a toroidal core, the 867-400 has a precise 2000:1 current ratio with an output of ±200mA for a ±400A primary current. The transfer linearity is better than 3ppm with a temperature coefficient of less than 0.3ppm/°C. Frequency response of the output current amplitude is from dc to 100kHz (-3dB) with a slew rate of ±200mA/16µs for a step change in primary current. Output current noise is less than 2ppm(rms) of full-scale from dc to 1kHz. Utilizing an appropriate external burden resistor enables voltage signal to be obtained e.g. ±1V full-scale with a 5 ohm burden resistor. The 867-400 has a mechanical outline of approximately 76mm (3 inch) square by 43mm (1.7 inch) axial length with a large 26mm (1 inch) diameter central hole for the primary current conductor. A dual +15V, -15V (±5%), 250mA power supply is required. Applications for the 867-400 include current control of particle accelerator corrector and focussing electromagnet power supplies, magnetic resonance imaging (MRI) gradient amplifiers, servo motor amplifiers and current measurement for precision power metering. Compared to resistive shunts or Hall effect current transducers the 867-400 provides greatly improved stability, lower common mode noise, much better linearity, reduced hysteresis and enhanced frequency response. Top of Page Danfysik buys the Synchrotron Beamlines Group of Oxford Instruments plc February 1, 2001 On January 25, 2001 Mr. Michael Russell (left), Finance Director of Oxford Instruments Superconductivity Ltd. and Dr. Bjarne Roger Nielsen, Managing Director of Danfysik A/S signed the final documents for the purchase by Danfysik of the Synchrotron Beamlines Group from Oxford Instruments. The new company, which will trade under the name OXFORD DANFYSIK, is a wholly owned subsidiary of Danfysik and based at Osney Mead in Oxford. Top of Page Danfysik to deliver Booster Accelerator for CLS March 15, 2000 Danfysik have been awarded a C$8.9M contract to deliver the Booster Accelerator for the Canadian Light Source (CLS) being built at the Saskatchewan Accelerator Laboratory (SAL) in Saskatoon. The Booster Accelerator will inject 1.5 to 2.9 GeV energy electrons into the main synchrotron radiation storage ring. Top of Page Bergoz completes testing of new FCT March 15, 2000 Bergoz have completed factory testing of a new Fast Current Transformer FCT with 0.7ns rise time and 0.1%/ µs droop. This prototype will be delivered to Brookhaven National Laboratory (BNL) for evaluation as a device to measure the proton beam current pulses in the Spallation Neutron Source (SNS) to be built at the Oak Ridge National Laboratory (ORNL). Top of Page Group3 CNAs chosen for control of SNS H¯ Ion Source March 15, 2000 At the front end of the SNS project, Group3 Control fiber optic isolated input/output modules (CNAs) are being used for computer control of the H¯ ion source developed at Lawrence Berkeley Laboratory (LBL). The fiber optic communication link enables reliable control and monitoring of electrical subsystems at high voltage and subject to electrical transients. Top of Page





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