Gaussmeter IGM11 Operating Instructions
Chapter 3 Function of the Gaussmeter
Page 16 / 106
MAGSYS
magne t
systeme
Version 01/2013
© 2013 MAGSYS magnet syste
me GmbH - All Rights Reserved.
As
B
r
as well as
B
is measured in the unit Tesla, the magnetic field measured on the
outside is often mixed up with the remanence.
Please note that
a magnet
without back iron only
shows a value clearly
below the
remanence
on the surface. Due to the local and geometry-dependent measurement, the
remanence of the workpiece cannot be checked reliably with a gaussmeter.
3.2.3
Accuracy Based on Positioning and Direction
Since the measuring value depends on the position, an accurate and repeatable
measurement depends on the exact positioning of the probe during the measurement.
The measurement on the pole center of the magnet is most uncritical. When moving the
probe on the pole surface of the magnet, the measuring value hardly changes at first.
When changing the distance though, the measuring value varies considerably.
The smaller the magnet to be measured, the stronger even slight misalignments
change the measuring value.
For quality-related research it is essential to ensure the
positioning accuracy.
Since a Hall probe only records one field strength vector, the correct alignment relative
to the magnet is important.
Please be particularly careful when measuring at the zero point at pole transitions. By
slightly tilting the probe, you measure additional lateral field shares that seem to
displace the zero passage.
In normal applications, a maximum flux density value is usually determined at a given
position. The measuring probe is placed in position and varied in location and direction
until the maximum is found. The device supports this measurement with the peak hold
feature.
Trial Version
Subje
ct to chan
ge
