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Reference Magnets - 11843 REFERENCE MAGNETS ?

Reference Magnets VM 4

Reference magnets generate a homogeneous mag-netic field in an air gap. They are mainly used to calibrate sensors for the magnetic field strength H or the magnetic flux density B . For example Gauss-meters, Teslameters or field strength measuring coils (search coils) can be calibrated using reference magnets. The transverse reference magnets VM 4 are available with different flux densities in a range from about 0.01 T to 1 T (0.1 kG to 10 kG). One model, which stands out in the product range, is the reference magnet VM 4 - 10 mm. It is designed for maximum accuracy and generates a flux density of 0.25 T in an air gap of 10 mm height. The homogeneity of the magnetic field in the air gap is so high that the calibration of the system can be carried out directly by a nuclear magnetic resonance (NMR) measurement.

Reference Magnet VM 4

Reference magnets VM 4 are available from stock in the following configurations: Model Air gap distance Air gap diameter Field strength H Flux density B VM 4 - 2 mm - 1 T 2 mm 20 mm 800 kA/m (10 kOe) 1 T (10 kG) VM 4 - 5 mm - 0,5 T 5 mm 35 mm 400 kA/m (5 kOe) 0.5 T (5 kG) VM 4 - 10 mm - 0,25 T 10 mm 50 mm 200 kA/m (2.5 kOe) 0.25 T (2.5 kG) Other flux densities in the range of about 0.01 T to 1 T (0.1 kG to 10 kG) are available on request, but require longer lead times. Length: 120 mm Width: 80 mm Height: 95 mm Weight: 2.2 kg The reference magnets contain long-term stable permanent magnets having low temperature coefficients. They are delivered in storage boxes. The flux densities and field strengths given in the tables are approximate values. The exact values are determined when the reference magnets are calibrated shortly before delivery.