PCE Instruments LM-MAGINSPECT Magnetic field tester

Magnet Analyzer (Permagraph), a cost-effective test device for measuring the hysteresis curve of hard-magnetic materials, offers high accuracy of measurement and is almost comparable with a permagraph in its precision.
MagInspect is particularly suitable for examining permanent magnetic materials such as magnet materials made from AlNiCo, ferrite, SmCo or neodymium. It provides accurate measurement of the hysteresis curve and supports the material testing and material analysis of these specialized magnetic materials.

The magnet analyzer (Permagraph) can replace a permagraph that determines the magnetic properties of materials. Furthermore, MagInspect is an affordable and easy-to-use test device that uses a pulse method to record the magnetization and demagnetization curve. The control unit and external pulse probe are equipped with innovative measuring electronics that allow for a precise and reliable measurement of the magnetization and demagnetization curve. A special advantage of MagInspect is that the geometry of the object to be measured is largely free, while special magnetic geometries are required for the measurement with a permagraph.

Typical application areas of MagInspect are:
- Material inspection and quality control
- Determination of the magnetic properties of materials
- Research and development
- Study new materials/alloys for magnetic properties
- Production control
- Monitoring the magnetization of components during manufacture
- Documentation
- Recording of the hysteresis curve in magnet production

Measurement parameters at MagInspect:
- Coercitive field strength (I_HC): Required magnetic field strength to reduce the magnetization of a material to
- Retenance (Br): Residual magnetization that remains in a material after the external magnetic field has been removed
- Saturation magnetization (Ms): Maximum achievable magnetization of a material
- Hysteresis loop: Curve, represents the relationship between magnetic field strength and magnetization


The impulse probe is equipped with a built-in hall probe which has a newly developed measuring electronics. It can record the measuring values of the Hall probe very accurately with a frequency of up to 10 KHz with a 16-bit A/D converter. At the same time, a magnetizing/demagnetizing point coil is integrated which generates the magnetizing/demagnetizing pulses. The control unit generates the individual pulses, while the sensor's electronic measurement unit accurately captures the magnetic peak field strength (H value) and the magnetic material's flow value (B value).
The complete measuring process takes place automatically, whereby 10-13 pulses are generated for the magnetizing process and the demagnetization process. The magnet material can be selected in the control unit to use the correct parameters.
Based on the individual H and B values, the controller generates the hysteresis curve in single steps, which is displayed on the color display. The IHcI_HcIHc coercive force and the remanence BRB_RBR are direct results of the hysteresis curve and provide important information on magnetic material analysis and material testing.
After the entire process has been completed, the values can be transferred to Microsoft EXCEL. Microsoft EXCEL offers the import function DataStreamer, which enables data to be transferred directly from the controller. A mathematical spline function implemented in an Excel Makro calculates and displays a precise hysteresis curve.

Quick procedure for determining the I_HC and Br values without hysteresis curve in manual mode

The magnetic analyzer (Permagraph) also offers the option of a quick method to compare the HC-values of a material for quality testing in the series. This process enables efficient and precise material testing in production to quickly evaluate the magnetic properties of materials and ensure quality.
The rapid method can be used to manually trigger a magnetization and demagnetization pulse matched to the magnetic material. The result is that the I_HC value (coercive force) and the Br value (retentivity) are directly displayed on the control unit.

Advantages MagInspect vs. Permagraph
The impulse process with the small probe achieves very high field strengths required to saturate the material. This high precision makes it possible to test and analyze the magnetic properties accurately, especially in the case of small or complex shaped magnetic materials.
An external, sophisticated magnetizer yoke with special pole inserts for different magnet geometries is not required. This simplifies material testing and material analysis, as the probe directly generates the required magnetizing and demagnetization pulses without requiring additional equipment.
The pulse method does not require any compensation coils to determine the B-value of the magnet material, because each pulse completely fades and there is no excitation field in the B-measurement.
The small impulse probe is largely independent of the geometry of the magnet, so that even external magnets on the rotors can be measured without any problems.
The magnet analyzer is also much cheaper than a permagraph and offers an efficient solution for magnetic material testing and material analysis.

This text is machine translated.