Physikalisch-Technische Bundesanstalt

Field measurements

The realization and maintenance of the unit Tesla of the magnetic flux density B as the base unit of magnetic quantities is an essential task of the working group. The dissemination of the unit Tesla is realized by:

Magnetic measurements basing on nuclear magnetic resonance (NMR)

Calibration of field coils as standards of DC fields and AC fields

Calibration of magnetometers in DC fields and AC fields

Measurements on magnetic materials

Calibration of magnetic characteristics of magnetic materials:

Calibration of single electrical sheet steel according to IEC 60404, part 2, 3 and 6

Calibration of susceptibility

Calibration of coercive force

Calibration of magnetic dipole moment

Special tests  on request, such as:

Measurement of field profiles on the coil axis

Permanent reference magnets

Thin magnetic films, i.e. hysteresis and coercivity

R & D

Reduction of measurement uncertainties of NMR measurements of fields up to 2 mT

Study of the natural line width of NMR spectra of fields up to 2 mT

Reduction of the measurement uncertainty and enlargement of the field area of measurements on sheet steel

Technology transfer

Development of a coil with reduced strayfield and low sensitivity to disturbances from external fields

Magnetic force microscopy imaging software

Equipment qualification of magnetic gradient sensors for the detection of unexploded bombs

Dimensional prerequisites:
Please contact us before ordering a test or request for calibration. We need to know the mechanical dimensions of the test object.
When ordering of tests on Epstein samples and sheets the dimensions and tolerances as defined in IEC 60404 - part 2 and 3 should be strictly maintained.

The measuring capabilities for magnetic quantities offered at PTB are listed at the BIPM's (Bureau International des Poids et Mesures) "Calibration and Measurement Capabilities" database (CMC).
Click here to get information from the BIPM website directly.

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