Ohtama Co., LTD. – Specializing in permalloy, magnetic shielding, magnetic field measurement, heat treatment and magnetic field cancellation.

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Magnetic field measurement services

In order to achieve the desired magnetic confinement and shielding efficiency, Ohtama provides accurate measurement under a range of anticipated conditions in a short period of time.

We invite you to utilize our environment measurement services when it is necessary to install a device that is susceptible to the effects of magnetic fields or to understand the magnetic field environment beforehand.

We can also measure magnetic fields emitted from equipment and measure shielding performance.

Our engineers can travel all over Japan to provide a comprehensive range of measuring services. (We also have experience conducting measurements overseas. Please feel free to inquire about our services.)

Magnetic field measurement services

Magnetic field measurement & analysis (on-site measurement)

Accurate magnetic field measurement technologies are important in order to protect valuable equipment from a variety of magnetic noise sources, including elevators, power sources, electric trains and cars etc.

Ohtama offers a comprehensive range of measurement services, including assessing and measuring the magnetic field environment for proposed sites for equipment that is susceptible to the effects of magnetic fields, such as electron microscopes and semiconductor inspection equipment etc. and other areas where magnetic fields are an issue.

Magnetic field measurement & analysis (on-site measurement)
Examples of on-site measurement services
  • ・Proposed sites for electron microscopes
  • ・Proposed sites for semiconductor manufacturing equipment
  • ・Proposed sites for large CRTs
  • ・Areas close to power lines
  • ・Areas close to transformers
Possible measurement parameters
  • ・Magnetic flux density  0.1nT – 3T
  • ・Wavelength  Static magnetic field – 1000Hz

*The above parameters may not apply depending on the combination of magnetic flux density and wavelength.

Measurement of magnetic fields emitted from equipment (emission measurement)

This involves the measurement of the magnetic field emitted from a range of equipment, including transformers and pumps etc.
By performing the measurement inside a magnetic shield room, it is possible to measure weak magnetic fields to approximately several 10nT. We can also perform measurements to conform to the IATA Dangerous Goods Regulations (assessment of magnetic properties of air cargo).

【Magnetic shield room】

Structure: paneled room

Material: Permalloy (PC, t=1)

Room dimensions: 2400 x 2900 x 2800 mm

Measurement of magnetic fields emitted from equipment (emission measurement)

Measurement of applied magnetic fields (magnetic field immunity measurement)

This involves assessment of the effect on equipment of devices emitting magnetic fields and measurement of the performance of magnetic shields.
This can be applied to large products by using an extra-large 3-axis coil.

Measurement of applied magnetic fields (magnetic field immunity measurement)
Examples of measurement of applied magnetic fields
  • ・Magnetic shield products
  • ・Damaged equipment
磁界測定可能な範囲
  • ・Magnetic flux density 0.1nT - 50μT
  • ・周波数範囲 静磁界~1000Hz

※磁束密度と周波数の組み合わせによっては上記の範囲内でも対応できない場合があります。

Main measuring equipment

Name No. Model Manufacturer Specifications etc.
BH Analyzer 1 BH-1000 Denshijiki Industry Co., Ltd. For direct current magnetic fields
  1 BHS-40 Riken Denshi Co., Ltd. For direct current magnetic fields (for soft magnetic materials)
HC Meter 1 K-HC1000 Tohoku Steel Co., Ltd. Measurement parameters  0.005 – 30Oe
Gauss Meter 3 FM3500 MTI Corporation 3-axis magnetometer, parallel fluxgate, measurement parameters: DC – 1kHz,  minimum resolution: 0.1nT
  2 FMS-3012T MTI Corporation 3-axis magnetometer, parallel fluxgate and air core search coil,  measurement parameters: DC & 20Hz – 10kHz, minimum resolution: 1nT
  1 FMS-3012 MTI Corporation 3-axis magnetometer, parallel fluxgate and air core search coil,  measurement parameters: DC & 40Hz – 500kHz, minimum resolution: 1nT
  1 FM-385 MTI Corporation Portable 3-axis magnetometer, parallel fluxgate, measurement parameters: DC – 1kHz,  minimum resolution: 10nT
Applied magnetic field coil 1 Large 5m x 5m For measuring the shielding efficiency of shield rooms
  1 Large 4m x 4m For measuring the shielding efficiency of shield rooms
  1 Medium 2m x 2m For measuring the shielding efficiency of shield rooms
  1 Small 1m x 1m For measuring the shielding efficiency of small products

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