Ohtama Co., LTD. – Specializing in permalloy, magnetic shielding, magnetic field measurement, heat treatment and magnetic field cancellation.
Magnetic field measurementmagnetic_field_measurement
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 & 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.
| Examples of on-site measurement services |
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| Possible measurement parameters |
*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 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.
| Examples of measurement of applied magnetic fields |
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| 磁界測定可能な範囲 |
※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 |
