42
c
HAPTER
3:
Operation
F71/F41 Teslameter
3.6.2.2.3 3-Axis
Multiple sensors are placed to measure three orthogonal field vectors, allowing the
measurement of both the overall field value and direction. This is particularly useful
in several scenarios:
D
Complex fields where the field direction is not known or changing over time
D
Quick handheld measurements
D
Field mapping of a volume
3.6.2.3 Stem Type
Each sensor can be housed in various stem types suited for different applications.
3.6.2.3.1 Standard
The general-purpose stem options offer an excellent balance of size and strength.
Constructed from extruded and precision machined aluminum, these stems are the
superior choice in most situations.
The sensor assembly is robust and able to survive impacts, but the rest of the aluminum
stem is hollow and may suffer slight deformation, particularly with longer stems. If this
occurs, it may be possible to apply gentle pressure to return the stem to its original shape.
Use caution; a snapped stem is not covered by the warranty.
3.6.2.3.2 Flexible
This stem type is currently only available as a transverse orientation option at a fixed
stem length. The surrounding aluminum stem of the standard probe is removed,
exposing the PCB and sensor element. This results in a somewhat flexible stem that is
also thinner than the standard stem type, making it the best probe for measuring in
very thin magnet gaps. This stem also features a helpful ruler printed directly on the
PCB, which is useful in determining how far the probe has been inserted into the mag-
net gap.
Excessive bending may cause the PCB stem to snap, so bending the PCB stem should be
minimized to extend the life of the probe. Purchasing a sample stem is recommended to
test the intended bending before bending the actual probe.
3.6.2.3.3 Cryogenic
Used for ultra-low temperature applications:
D
Non-magnetic stainless-steel alloy minimizes heat leak, while providing
strength
D
Greater stem lengths offered as standard to reach into the cryogenic environ-
ment
D
Vented at the tip to allow cryogens to escape safely
D
Cryogenic 2Dex™ sensors used in place of standard sensors
These probes do not contain an integrated temperature sensor. Temperature compensa-
tion may be achieved by setting the temperature using an external source.
See section 3.5.6.
3.6.2.4 Stem Length
Stem length is defined as the distance from the end of the handle or mounting fixture
to the tip of the probe. Please be aware that stem deflection can occur on longer
stems when aligned horizontally.
FIGURE 3-39
3-Axis orientation
