Gauss Meter

The Gauss meter or teslameter is a magnetic sensor magnetometer that measures magnetic induction intensity such as AC and DC magnetic fields, radiation magnetic fields, residual magnetism, earth magnetic field, etc. The gaussmeter consists of a Hall probe and a measuring instrument.

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Dexinmag is a world-renowned Chinese manufacturer specializing in producing Gauss meters or Teslameters.

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What is a gauss meter?

Working Principle of the gauss meter

The Hall probe as a sensor generates a Hall voltage due to the Hall effect in the magnetic field. After measuring the Hall voltage, the magnitude of the magnetic induction intensity can be determined according to the Hall voltage formula and the known Hall coefficient and displayed on the instrument.

Parameters of the digital gauss meters

Model	Range	Frequency	Min.Resolution	Accuracy	Programmable	Test dimension
DX-102	±3T	DC	0.01mT	±1% of reading	No	1D (handheld)
DX-102F	±3T	DC - AC	0.01mT	DC: ±1% of reading ± 0.05% of range AC: ±3% of reading ± 0.5% of range	Yes	1D (handheld)
DX-103	±2T	DC - AC	0.01mT	±1% of reading ± 0.05% of range	No	1D
DX-1205F	±3T	DC	0.001mT	±0.45% of reading ± 100uT	Yes	1D
DX-150	±3T	DC - AC 30KHz	0.01mT	DC: ±0.3% of reading ± 0.05% of range AC: ±2% of reading ± 0.5% of range	Yes	1D
DX-160	±10T	DC - AC 50KHz	0.01uT	DC: ±0.2% of reading ± 0.05% of range AC: ±1% of reading ± 0.5% of range	Yes	1D
DX-180	±30T	DC - AC 100KHz	0.01uT	DC: ±0.05% of reading ± 0.005% of range AC: ±1% of reading ± 0.5% of range	Yes	1D
DX-210	±30T	DC - AC 100KHz	0.01uT	DC: 1D - ±0.05% of reading ± 0.005% of range 2D - ±0.1% of reading ± 0.005% of range AC: ±1% of reading ± 0.5% of range	Yes	2D
DX-350	±3T	DC	0.001mT	±0.45% of reading ± 0.005% of range	Yes	3D
DX-360	±30T	DC - AC 100KHz	0.01uT	DC: 1D - ±0.05% of reading ± 0.005% of range 2D - ±0.1% of reading ± 0.005% of range 3D - ±1% of reading ± 0.005% of range AC: ±1% of reading ± 0.5% of range	Yes	3D
1T=10³mT=10⁶μT=10⁴Gs

CE certificate of Gaussmeter

Each Gaussmeter is equipped with a standard hall probe.

Types of Hall probes

The Hall probe is a key component in making a Gaussmeter, which determines the performance and quality of the Gaussmeter.

Ultrathin and miniature GaAs hall sensors produced by Dexinmag company in the world's leading level have a stable linear output of 0.1uV at the minimum. The full scale of linearity (0-3T) is maintained at an excellent level of ±0.05%, and the temperature drift is <-0.015%/℃.

Transverse probe is usually a thin rectangular shape and is successfully used for various magnetic fields, surface measurements of magnetic materials, or small gaps and general open field measurements.

Axial probe is usually cylindrical. Its applications include measurements borne by the center of a ring magnet, solenoids, surface field detection, and general magnetic field induction.

Flexible probe is a flexible epoxy resin package. The probe part is not strongly protected and is easily damaged, but it is ultra-thin at only 0.30mm and is used in narrow gap measurement applications.
Two-dimensional and three-dimensional probes are usually cylindrical or square and are used to measure two-dimensional and three-dimensional device magnetic fields and spatial magnetic fields.

Warning: Be very careful when handling the probe. The probe tip is very easy to break. Applying stress to the Hall sensor will change its calibration data. Any excessive stress will easily break the sensor, and the broken sensor cannot be repaired.

Factors affecting the test value of Gauss meter

The larger the angle between the probe tip and the magnetic field direction, the greater the percentage error of the reading.

Wrong test method: The Hall chip is at a certain angle to the magnetic field, not perpendicular, which brings errors to the measurement.

ordinary test method of gauss tesla meter

Ordinary test method: Manually adjust the measurement direction and position, but the measurement repeatability cannot be guaranteed.

the best test method of gauss tesla meter

The best test method: Fix the probe with a bracket to prevent the probe from shaking, and the best test direction can be found by adjustment, that is, the direction in which the Hall chip is completely perpendicular to the magnetic field.

The positions of the Hall elements in different probes are different.
These probes will not sense the change of magnetic field due to the change of position in a uniform magnetic field, and the measurement data will not be inaccurate due to the different positions. When different probes are used to measure the divergent and uneven magnetic field on the surface of the magnet, although the surface appears to be placed in the same position, the internal Hall element actually senses the magnetic field at a different position. (Generally, the smaller the size of the measured magnet, the greater the curvature of the magnet surface, the more uneven the surface magnetic field, and the greater the difference in the measured data).

The sensitive area size of the Hall element encapsulated in different models of Hall probes is different.
In the early germanium and silicon Hall elements, the effective sensitive area is basically the size of the element itself, with a large area. If this Hall element is used to measure the surface magnetism of small magnets, corners of magnets, or multi-pole magnetized small magnets with divergent magnetic lines of force. It can only reflect the average value of the magnetic induction intensity passing through the surface of the element. This value must be less than the maximum value of the area.
If a Hall element with a small sensitive area is used instead, such as a gallium arsenide Hall element, the effective area of its sensitive area is about 0.1×0.1～0.2×0.2mm², which is much smaller than the area of germanium and silicon Hall elements. This element can better reflect the field distribution of the surface magnetic field, and the maximum value measured is closer to the actual value of the maximum magnetic induction intensity in the area.

Temperature will also affect the accuracy of the probe. Please try to use the probe at a temperature near 20℃.

Metal package probes are the best choice for DC and low-frequency AC because they provide the best protection. Brass is the best choice among non-ferrous metals, but it will produce eddy current effects in AC environments above 800 Hz, causing certain errors.

Non-metallic packaging is the first choice for high-frequency AC environments, but it is easy to damage.

DX-102F Portable Gauss Meter

Dexinmag company is a technology company specializing in fully digitalized automated magnetic measurement systems, high-precision digital magnetic detection equipment and digital magnetic field control. Relying on the advanced technology of the Chinese Academy of Sciences, we develop and produce high-precision one-dimensional, two-dimensional and three-dimensional Hall probes (with temperature compensation) and multi-dimensional high-precision and high-resolution gaussmeters, and have passed ISO9001 and IQNET international system certification. Many performance and parameters can reach the international advanced level. And it has been used many times in aerospace, military industry, navigation, scientific research and colleges and universities, and has been widely praised.