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Caution: Connect the Mag648/Mag649™ sensor before the supply is energized, as this
prevents high surge currents which could cause damage.
Note: Apply the positive and negative supplies simultaneously, and avoid leaving the
electronics board connected to one polarity only.
The analogue output of the sensors as well as the power supply connectors are available on the
outline drawing DR2389.
Where no Bartington power supply or acquisition unit is used, some basic recommendation for
integration of the sensor are available in AN0042.
5.3. Mounting Recommendations
Each magnetometer has a set of mounting holes to allow attachment to a stable base or fixture.
Refer to the mechanical drawings on the product page.
Caution: (For the Mag648S and Mag649S only) Take care to align the cable to the connector
correctly, to avoid damage to the connector or magnetometer. When aligned correctly,
hand tighten the connector. Refer to the product brochure for detailed information.
Caution: (For the Mag648U and Mag649U only) Allow for recess above the coil blocks when
mounting the sensor. Mounting screws may protrude on top.
Note: Other versions of the Mag648 and Mag649™ have plug-in type connectors.
The sensor can also mounted on the Bartington Instruments Mag-TA Universal Tripod Adaptor.
See drawing DR3140, available from Bartington Instruments, for instructions on how to do this.
6. Using the Mag648 and Mag649™
6.1. Mag648 and Mag649™ Operation
The sensor will provide an analogue output which is proportional to the field measured. Please
refer to DS2298 for the sensor's scaling factor.
Testing of the sensor's response can be done, as an example, by moving the sensor in the Earth's
field and ensuring that the signal varies in relation to orientation. In the horizontal plane, a
minimum value is obtained when the axis is in the magnetic East-West direction, and maximum
when pointing Magnetic North.
BARTINGTON INSTRUMENTS
Page 6 of 9
OM2298/4
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