Lakeshore 425 - Probe Operation

3.6.3 Pr obe Opera tion 25
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3.6.3 Probe Operation
In the DC mode of operation, the orientation of the probe affects the polarity reading
of the gaussmeter. On a transverse probe, the Lake Shore name printed on the handle
indicates the side for positive (+) flux entry. On an axial probe, positive (+) flux entry is
always from the front of the probe’s circular face (FIGURE 3-6).
For best results, the instrument and probe should warm up for at least 5 min before
zeroing the probe, and at least 30 min for rated accuracy. Also, the probe and the magnet
being measured should be at the same temperature. Simply handling the magnet can
cause sufficient temperature change to cause the reading to drift.
FIGURE 3-5 Proper mounting of the probe
FIGURE 3-6 Probe orientation for positive measurement
B
N
S
N
S
B
Lake Shore logo
towards north pole
Transverse probe orientation
for positive (+) measurement
Axial probe orientation for
positive (+) measurement