List-Magnetik Magnetic field meters / Gaussmeters
How strong is a magnetic field? - Measuring magnetic field strength
This question is asked to determine the peak value of a magnet or residual magnetism. Devices that perform this task are called magnetometers, magnetic field meters, teslameters, or gaussmeters.
The measured value depends on the measurement position and the probe design
A DC field without polarity reversal is considered here. The field lines of a magnetic field run from the north pole to the south pole of the magnet. In a bar magnet, for example, the poles are usually located at each end. This is where the field is strongest. Depending on the shape of the magnet, the field lines run differently; in the case of a horseshoe magnet, they run parallel within the arc. The closer to the pole the magnetic field is measured, the stronger it is.
Inside the probe, a so-called Hall sensor registers the Lorentz force, from which the field strength is calculated. The closer the Hall sensor is to the pole, the greater the force. Different probe designs (axial, transverse) have different arrangements of the Hall sensor and lead to different measured values.
You have to find out during the measurement: Where are the poles? In which direction does the probe measure the most? Does turning or swiveling the probe cause a change? In this way, each individual magnet can be examined for its maximum field strength.
Magnetic field measurement, remanence measurement - what do you need?
In what units is magnetism measured? Depending on the instrument, gauss (Gs) or milli-tesla (mT) may be displayed in addition to the basic unit of A/cm. It is important to know what maximum field strengths can be expected. List-Magnetik offers a selection of instruments and probes for any purpose, whether as a one-hand instrument, with a separate probe, or as a laboratory instrument.
The MP-810, MP-1000 and MP-4000 magnetic field meters can be used here, while the MP-80 is particularly suitable for remanence.
What is the difference between axial and transversal probes?
Axial probes measure in the direction of the probe plunger. Transverse probes measure at a 90° angle to the probe. Transverse probes are better suited for measurements in cavities or narrow tubes. In summary, the transverse probe is the more universal tool. This is because virtually all axial probe measurements can also be performed transversely. An advantage of the axial probe from List-Magnetik is the distance of 2 mm between the Hall sensor and the probe cap. This value has become the de facto standard for the probe in ball bearing production.
Pulse measurement and peak value
To measure a magnetic pulse, the peak value must be recorded. Short pulses are much too fast to read on the display. With a peak value display and a graphical progression curve, pulses can be analyzed on the time axis.
Rotor analysis
The pole changes of a rotor form a waveform with changes between north and south poles. Whether a rotor is correctly and evenly polarized can be determined by a uniform rotation of the rotor in a measurement period. Here too, the graphical progression curve helps to detect irregularities.
Calibration Standard / Reference Magnet - An important accessory for the magnetic field meter or gaussmeter
A calibration standard is a reference magnet, a permanent magnet that always shows the same value for the same position of the same probe. This provides a reliable means of verifying that the probe is working properly.
The combination of instrument, probe, and standard forms a unit that is calibrated and certified together. Using a probe on a calibration standard that has been calibrated with another probe may result in a slight deviation of the reference value. This is due to the fact that the probes cannot always be made exactly the same. However, this deviation is always constant.
Data Transfer from Magnetic Field Meter / Gaussmeter to PC or Application
Do you need to document or archive your measurement series? Do you want to detect extreme values and perform statistical evaluations? Then the MP-4000 with data transfer to Windows PC, Android app or iOS app is the right tool for you.
The MP-810A/-810T and MP-80 also offer communication with Android, iOS and Windows.
The apps allow further processing of measurement series in Office applications. Integration with CAQ systems is also possible.
