Abstract
The field strength in an ideal quadrupole field is B( r) = g· r, where g is the gradient and r the distance from the neutral axis. It is possible to check the constancy of the field value at the distance r from the axis by means of a Hall probe, if the probe, which is led on a circle around the neutral axis, follows the given direction of the field also by rotation around its own axis. The two movements are coupled in a program-controlled measuring machine in which an adjusting device aligns the sensitive axis of the probe with its axis of rotation. The respective admixtures of higher multipole orders can be analysed from the fluctuation of the field value along the circle traversed.
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