Source for Helmholtz Coils

Build one. It's just wire.

John

Well, that is interesting and then I suppose I would require a gaussometer and drive circuitry. Unfortunately, the cost in time alone would likely outweigh the benefit and a high quality/resolution device is required. This is a commercial venture so often it's best to simply purchase a tried solution.

I would, however, be interested in receiving your basic winding data, perhaps as a hobby venture. Shawn

True, it is simply wire ;)

If you want a set of 1 meter Helmholtz Coils to calibrate magnetoresistive sensors, then presumably you've determined that you need a volume of fairly flat magnetic field with dimensions like 10 or

If you can live with a substantially smaller area of flat field, you can use a much more compact non-Helmholtz coil setup and a gaussmeter to do your calibration between the poles. Gaussmeters are rather common at used test equipment houses and Ebay.

Tim.

That's valuable information. Thank you.

What is your recommendation for a "more compact non-Helmholtz" arrangement. Solenoid?

thanks

I read in sci.electronics.design that mully wrote (in ) about 'Source for Helmholtz Coils', on Mon, 31 Jan 2005:

Why not consider making one? I can supply the basic winding data, if you want to try.

Helmholtz coils have a fairly uniform field within a third of the diameter and a third of the length. They are easy to calculate and easy to wind yourself.

Rene

A few years ago I built a Helmholtz coil. It wasn't difficult, but the most expensive and long winded part could well end up being calibration. Do you have to produce calibration documents for test equipment you use? If you do then just buy one and let someone else have to deal with the hassle!