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3.6.4.1.3 Transverse Cryogenic (TC): Future release.
3.6.4.1.4 Axial Standard (AS)
The active area of this stem is located beyond the aluminum housing a fraction of a
millimeter from the tip. It is centered on the axis of the stem without any visual indi-
cation of where the active area is located.
3.6.4.1.5 Axial Cryogenic (AC): Future release.
3.6.4.1.6 3-Axis Standard (ZS)
The three individual sensors don’t occupy the same point in the probe, so the three
separate measurements are for slightly different positions in space. This results in the
specification of an active volume, as opposed to an active area for single-axis probe
variants. Orthographic views of the sensor active areas are laser etched onto the alu-
minum stem. There is no indication of active areas on the tip of the probe (Z-axis).
3.6.4.2 Polarity
Given that Hall sensors are directional, the orientation of the probe will determine
whether readings are positive or negative.
3.6.4.2.1 Transverse
Polarity can easily be confused on transverse probes as twisting the probe 180° will
result in a reversed polarity. When looking at the tip of a transverse probe, a positive
field value will be reported when the magnetic field is orientated as shown below.
When placed in magnet gaps, the tip of the probe may not always be visible. In this
situation, the handle of both the handheld and mountable probes are marked to
indicate polarity:
D
Handheld:
one side of the handle has a field indicator badge showing that a posi-
tive field reading will result when the field direction is in the handle through the
badge.
D
Mountable:
the Lake Shore logo is present on only one of the mounting surfaces.
When the logo is facing up, a positive field reading will result when the magnetic
field is passing left-to-right through the sensor.
FIGURE 3-48
Axial standard (AS) probe
active area
FIGURE 3-49
3-Axis standard (ZS) probe
FIGURE 3-50
Transverse polarity
FIGURE 3-51
Handheld probe
FIGURE 3-52
Mountable probe
