6.3 Probe Operation
For best results, the instrument and probe should warm up for at least 5 minutes before zeroing
the probe. The probe and the shielding chamber should be at the same temperature.
In the DC mode of operation, the orientation of the probe affects the polarity reading of the
gaussmeter. On a transverse probe, either a label on the handle or a dot on the handle or on the
probe stem indicates the side for positive (+) flux entry. On an axial probe, positive (+) flux
entry is always from the front of the probe.
Fig. 3 : Probe orientation for positive reading
If the exact direction of the magnetic field is unknown, its orientation is determined by turning
on Max./Min. and slowly rotating the probe. As the probe turns and the measured field rises
and falls, its maximum value is held on the display. Make note of the probe orientation at the
maximum reading to identify the field orientation.
6.4 Probe Types
Three different standard probe Types are available for the FH 55. They are transverse, axial and
surface field probe.
The transverse probe has a Hall sensor that is mounted parallel to the probe axis. It measures
fields, that are perpendicular to the probe axis. A typical application is the measurement in the
air gap of magnet systems.
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