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To provide reliable measurements, magnetometers used in industry need to be calibrated regularly. The calibration may be performed by the manufacturer or by a commercial calibration laboratory. In either case, the calibration requires a standard, which is usually established and maintained by a national standards laboratory, in collaboration with international standards committees.

NMR magnetometers: a secondary standard of primary importance

A physical magnetic standard – i.e. a high-precision standardized magnet – is too expensive for widespread use. Instead, very precise time standards and the precise measurement of a physical constant called the gyromagnetic ratio permit NMR magnetometers to act as a convenient secondary standard. Now, the field generated by a relatively inexpensive reference magnet can be measured with an NMR teslameter, and then used to calibrate other magnetometers.

Metrolab: the standard of the standards

As the pre-eminent manufacturer of commercial NMR magnetometers, Metrolab enjoys a privileged position in the calibration and standards laboratories. Precision, measurement range, ease of use and reliability are Metrolab trademarks that are familiar to nearly every magnetic calibration facility.

Do-it-yourself calibration

Although reference magnets can be relatively inexpensive, they are usually still large and specialized pieces of equipment. For this reason, magnetometer calibration is performed in only a few specialized facilities, which leads to expense and logistical overhead when many instruments need to be calibrated.

For calibration at specific field strengths, Metrolab offers a solution: a line of ultra-compact permanent magnets with an opening large enough for an NMR probe as well as the instrument to be calibrated. Using a built-in correction coil, the field can even be regulated to NMR precision. If you received our magnet / teslameter kit in the morning mail, you could be calibrating before lunch!






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