Magnetic Moment and Magnetic Declination Measurement System

Put the magnet on the sample table, test the magnetic flux component by the pulling method, and obtain the magnetic moment and the deviation angle of the magnetic field in the direction of the main axis by calculation. It can display the total magnetic moment M, spindle magnetic declination α, Øx, Øy, Øz, and the coil constant of the corresponding test coil.


The hardware composition is high-speed 32 digitals M4 single-chip system, 3 sets of built-in fluxmeter, 7 inches 800*480 resolution LCD.


The front panel is shown as follows:



The back panel is shown as follows:

A single Helmholtz coil can be used to measure the magnetic moment M produced by the permanent magnet in the magnetization direction. The magnetic moment M can be obtained through the relational expression M=KH×Φ, in which KH is the Helmholtz coil constant, while the Φ is the magnetic flux of the magnetic induction to the coil. As for the quality inspection of the permanent material samples after being magnetized, the Helmholtz coil is adopted and it is getting quite popular and universal. It is extremely important for the designed one-dimensional and three-dimensional Helmholtz coil to participate in the mutual parameter transmission with its international peers.

Through the efforts of the company's collective wisdom, DX-2012AM magnetic declination measuring device was completed and can be put on the market as a new product. Compared with the original prototype, this equipment improved the design of the machine body, add a pneumatic push sample structure for the separation of large rare earth permanent magnet samples, and coil constants K of XY axis coils are designed to be under 0.015cm. All of these meet the needs of customers at home and abroad. As the equipment does not involve the use of graphic records, we change the computer configuration to laptops, mainly used as the record of the test samples, and all the recorded parameters can be directly printed out.


Configuration of DX-2012AM permanent magnet magnetic declination measuring instrument


Item Name




magnetic declination test host




3-axial helmholtz coil




magnetic declination testing software




Lenovo PC




HP printer




Special working platform




Technical Parameters


1. DX-2012AM magnetic declination test host

Three-channel fluxmeter


  1. Fluxmeter range: 1mWb/10mWb/100mWb/1000mWb, four gears, accuracy: 0.5%;
  2. Fuxmeter resolution: 0.01%, 0.1uWb min.;
  3. Input impedance corresponding range: 1kΩ/10kΩ/100kΩ/1MΩ;
  4. Drift: 1uWb/min (corresponding to 10mWb test range after adjusting stably).
Host function


  1. Directly display the flux of a three-channel fluxmeter;
  2. Directly display magnetic declination θz of the tested sample;
  3. Comparison between θz and the setting value, easy to judge qualified or unqualified and classify high-precision products;
  4. Stand-alone test or connect to PC with RS232 interface and automatically record test data ;
  5. Repeatability and reproducibility of magnetic moment M and magnetic declination θz is less than 10%.


2. DXHC150 3-aixal helmholtz coils (round-shape)


  1. XY coil constant designed as: 0.015 Wb*cm/V*s, calibration accuracy: better than 0.5%;
  2. Z coil constant designed as: 0.05 Wb*cm/V*s, calibration accuracy: better than 0.5%;
  3. Coil orthogonal angle: better than ±0.2°;
  4. Main axial coil (Z coil places up and down, easy to improve the test accuracy of magnetic declination);
  5. Test sample range:
    a. 30mm3~150mm3 (homogeneous area: 0.3%);
    b. 30mm3~30mm3 (homogeneous area: 1.0%).


3. DX-2012AM magnetic declination testing software


  1. Automatically record the serial no. of the tested sample;
  2. Automatically record θz, total magnetic moment M and flux Øx、Øy、Øz.
  3. Coil resistance is Ohm, directly input, test software auto-corrects fluxmeter amplification coefficient to ensure the test accuracy.


4. Testing capability (the second table is Mastesy’s test result, 1Am2=1.2566uWb*m)




The DX-2012AM Magnetic Moment and Magnetic Declination Measurement System is composed of a three-dimensional Helmholtz coil connected to an independent three-component fluxmeter, which constitutes the hardware test part. The three-component test data is converted by a computer to form a complete set of permanent magnets Material quality testing system.
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