Gaussmeters and Hall Probes

Buy Gaussmeters and Hall Probes Online with Bunting – eMagnets™
A gaussmeter is used to measure the magnetic field strength (magnetic flux density). The units of measurement are usually Tesla or Gauss (A/m and Oersted can also be used).

Transverse Hall Probe
The Transverse Hall Probe is a long, thin probe (rectangular in section) with the Hall Effect device at the end of the probe. It measures the field in the axis perpendicular to the main length of the probe. It is ideal for placing within small gaps to measure the fields in speaker assemblies, etc. The field can be measured with either face of the Transverse Hall Probe, with one face usually marked to indicate the side giving a positive value from a North face for repeatability in measuring.

Axial Hall Probe
The Axial Hall Probe only has a single method of measuring magnetic field strength. The probe is at the end of a cylinder, and it measures the field in the axis of the cylinder. The measurement has a distance offset to be compensated for, like the Transverse probes. X-ray scans can reveal the location of the active element in the Axial Hall Probe for improving accuracy. We offer a range of high-quality Gaussmeters and probes for professional measurement taking. All are fully calibrated and are supplied in hard plastic protective casings with complete instructions and the calibration certification included.

GM07 Gaussmeter
The GM07 Gaussmeter is a hand-held Gaussmeter calibrated to standards traceable to the National Physical Laboratories (London, UK). It comes with auto and manual ranging and auto and manual power-down. It measures DC, DC Peak, AC RMS, AC RMS MAX, and AC Peak fields. It has four ranges: 0-3 Tesla, 0-299.9 mT, 0-29.99 mT, and 0-2.999 mT (measurement units available are Tesla, Gauss, Amps/m, and Oersted). It is supplied with a TP002 Transverse Hall Probe (with a hold button), a Zero Flux Can, and a case (four 1.5V AA batteries are not included). Accuracy is better than ±1% Probe and Gaussmeter (NPL Traceable). Reproducibility is ±0.5%. The temperature coefficient is better than ±0.1% of reading/°C, including the probe. The product is supplied with a Calibration Certificate and Instruction Manual and is supplied within a Hard plastic carrying case. Please allow up to 2-3 weeks for delivery for this item (other parts ordered will be shipped separately).

GM08 Gaussmeter
The GM08 Gaussmeter is a hand-held Gaussmeter calibrated to standards traceable to the National Physical Laboratories (London, UK) with RS232 and USB communications and memory storage. An uncorrected analogue output (-3V to +3V) is also provided. It comes with auto and manual ranging and auto and manual power-down. It measures DC, DC Peak, AC RMS, AC RMS MAX, and AC Peak fields. It has four ranges: 0-3 Tesla, 0-299.9 mT, 0-29.99 mT, and 0-2.999 mT (measurement units available are Tesla, Gauss, Amps/m, and Oersted). It is supplied with a TP002 Transverse Hall Probe (with a hold button), a Zero Flux Can, and a case (four 1.5V AA batteries are not included). Where individual measurements need to be recorded, the GMO8 will store up to 100 values and upload not only the measured values, polarity, measurement units, and measurement function but also the time at which the measurement was taken. Windows communication software is supplied with the GMO8. This allows the user to download readings, store data, and control the instrument remotely via USB or RS232 interfaces. Data can be downloaded to Excel, OpenOffice spreadsheets, or a CSV format file. Accuracy is better than ±1% (NPL Traceable). Reproducibility is ±0.5%. The temperature coefficient is better than ±0.1% of reading/°C, including the probe. The product is supplied with a Calibration Certificate, Instruction Manual, USB lead, RS232 lead, analogue adaptor to allow BNC connections, and a software disc – all within a Hard plastic carrying case. Please allow up to 2-3 weeks for delivery for this item (other parts ordered will be shipped separately).

AP002 Axial Hall Probe for GM07/GM08 Handheld Gaussmeters
The AP002 Axial Hall Probe is specifically designed for use with the GM07/GM08 Hand Held Gaussmeters. It offers full interchangeability with these gaussmeters.

Delivery Information
Please note that delivery of this item may take up to 2-3 weeks. If you have ordered other parts, they will be shipped separately.

Measurement Considerations
When using the Axial or Transverse Hall Probes, it’s important to consider the angle at which the probe is placed relative to the direction of the magnetic field. This angle can introduce a cosine error, resulting in a measurement that is lower than the actual field strength. The percentage of the total available field measured can be calculated using the formula cosine(D°) x 100%, where “cosine” is a trigonometric function commonly found on calculators as “cos”. For example: If the Hall Element is perfectly aligned (D°=0°), 100% of the available field strength is measured. If the Hall Element is 30° out (D°=30°), 86.6% of the field strength is measured. If the Hall Element is 60° out (D°=60°), 50% of the field strength is measured. If the Hall Element is 90° out (D°=90°), 0% of the field strength is measured.

Choosing Between Axial and Transverse Probes
Axial probes are known for their sturdy design, making them suitable for general measurements. On the other hand, Transverse probes are often preferred for placing onto flat surfaces and measuring in small air gaps. However, they are less sturdy and can break if mishandled. The choice between the two depends on the specific measurement requirements; either type of probe can be used depending on the measurement location.