Gaussmeter Selection Factors
One of the most significant aspects of selecting a gaussmeter
is the dimensions of the Hall probe. For transverse probes, this
usually this means the thickness . If you want to measure the
magnetic flux density in a loudspeaker magnet assembly air gap,
thick probes womt do! Hirst's standard Hall probe is 1mm thick
and offers a very robust probe for its thickness.
Some applications will require thinner probes or probes of
different arrangements. As well as offering a wide range of standard
"special" probes Hirst also offers a custom Hall probe service. All
probes are interchangable with Hirst instruments without the need for
The accuracy of an instrument is the tolerance between what the instrument displays and the actual value. All Hirst Gaussmeters are better than 1% accuracy, which is the quoted figure.
The repeatability of an instrument is how repeatable a measured value will be. If you were to measure the same magnetic flux density multiple times the reading would not vary by more than the repeatability.
It is important to ensure that for your desired application the Gaussmeter has an appropriate range and resolution for your requirements.
Each range will have a maximum value and a resolution.
This is the smallest unit of magnetic flux density that the unit can display. Typically each range has its own minimum resolution.
All Hirst Gaussmeters can display measurements in both SI and CGS units of magnetic flux density and magnetic field strength. These units are Tesla, kA/m, Gauss and Oersted.
This provides the user with the ability to measure both magnetic field strength and magnetic flux density in the units they prefer.
If you wish your Gaussmeter to interact with external hardware or with PC software then you should select a model with external interfaces. Possible interfaces include RS232 and USB.
RS232 is a slow protocol but allows the capture of data and control from the instrument from a PC (using supplied software) or via some other external system.
USB is a fast protocol that allows measurements to be captured at a much faster rate. Full control of the instrument is also available.
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