Bartington Mag-01 Operation Manual page 7

for this reason, no provision has been made within the magnetometer electronics to
provide direct reading.
When using the high field probes, the displayed values and offset (Mag-01H) should be
multiplied by 10 to obtain the true reading. For these probes the maximum analog output
range is ±2V, corresponding with the maximum range of the LCD (2mT).
High Field Probe Type D/S (2.0mT)
Special probe type D/S possesses a shorter (9mm) sensing element and, when used in
conjunction with the Mag-01(H) specially set up for the purpose, will permit
measurements using the analog output of up to ±5.3V, equivalent to ±5.3mT, with the
o
probe at a temperature no higher than 25 C. Above this temperature the measuring range
of the probe will decrease.
Transverse and Axial Probes
High and low field probes are available in either axial or transverse construction. For
axial construction, the sensing direction is in the direction of the connecting cable entry.
For transverse probes the element is in the T section which is perpendicular to the
direction of cable entry.
Standard Packaging (Probes Type B, C, D, E)
Axial and transverse probes for normal (non-cryogenic) applications are housed in a
robust brass outer case which accurately defines the probe outline for mechanical
registration purposes and gives a high degree of environmental protection. The sensing
element and cable are moulded within the tube using GRP (glass reinforced plastic) to
provide hermetic sealing and create a very strong package.
When clamping these probes in fixed installations the clamp pressure should ideally not
be applied in the region of the sensing element. These probes are engraved with an arrow
indicating the sensing direction and a spot indicating the centre of the sensitive region.
3.3 Cryogenic probe type F (0.2mT) and type G (2.0mT)
These probes are of axial construction only. They are designed for continuous operation
down to liquid helium temperature. The use of a minimum number of dissimilar
materials in their construction makes them tolerant to the stresses induced by shrinkage
which are incurred during cooling. The power dissipation has been kept to a minimum.
The power levels stated in the specifications are the maximum values which occur as full
scale measurements.
The four enamel-coated 1m x 0.2mm diameter copper connecting wires should be
subjected to the minimum amount of flexure to avoid fractures. The probes are
unprotected and should be handled with great care.
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