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Re: Hall effects probe
Thanks for the info, steve.
It is a great start.
Nathan
>From: Tesla List <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Hall effects probe
>Date: Sun, 26 Mar 2000 10:06:14 -0700
>
>Original Poster: "Steve Cook" <Steve-at-g8cyerichmond.freeserve.co.uk>
>
>There are two main types of hall effect devices available, what you want is
>an analogue probe.
>A Hall probe is simply a rectanular plate of semiconductor material. A DC
>voltage is applied across two opposite edges. The output signal is taken
>from the remaining two edges. An applied magnetic field deflects the flow
>of
>electrons travelling between the input electrodes, producing a dc signal
>betweeen the ouput connections. The level is low and high impedance, it
>needs amplifyoing before it is any use for measurement, a single op-amp is
>sufficient. Because of the low level, the output leads need to be screened.
>You will then of course need a suitable analogue to digital converter to
>interface with your computer.
>I must admit that it is some years since I designed a circuit for a
>magnetometer using one, and the supplier I then used no longer stocks Hall
>devices. A major components stockist may be able to help, it will be a
>matter of searching some on-line catalogues.
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