Lake Shore Model 421 - 3.16.3 Probe Operation; Maximum Flexible Probe Bend Radius

Lake Shore Model 421 Gaussmeter User’s Manual
3-14 Operation
45°
45°
Flexible Transverse Probe
Maximum Bend Angle
Do not bend from
tip of probe
Stem
The tip is
VERY FRAGILE
C-421-3-4.eps
Figure 3-4. Maximum Flexible Probe Bend Radius
3.16.3 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.
See Figure 3-5.
NOTE: For best results, the instrument and probe should warm up for at least 5 minutes before
zeroing the probe, and at least 30 minutes for rated accuracy. The probe and the zero
gauss chamber should be at the same temperature.
If the exact direction of the magnetic field is unknown, the proper magnitude is determined by turning
on Max Hold and slowly adjusting 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.
B
N
S
Transverse Probe Orientation
For Positive (+) Measurement
Axial Probe Orientation
For Positive (+) Measurement
N
S
Lake Shore Logo
Towards North Pole
B
C-421-3-5.eps
Figure 3-5. Probe Orientation For Positive Measurement