Specifications

BARTINGTON INSTRUMENTS
Page 5 of 12 M2240 ISSUE 1
Installing the Mag639
Siting the Magnetometer (Environment Recommendations)
The magnetometer should be sited several metres from any magnetic base rock to avoid compromising
measurements
Site the magnetometer several tens of metres from very large ferromagnetic objects that could become
magnetised and create fields exceeding the measuring range of the sensor
Avoid siting the sensor near any ferromagnetic objects that may be subjected to the effects of magnetic
hysteresis, which would affect the sensor in an unpredictable manner
For these reasons, a magnetic evaluation of any proposed installation site should be conducted to establish
that it is free from magnetic contaminants. It is recommended that such an evaluation be carried out using
total field or resonance magnetometers.
Connection Recommendations
Connector pin allocation
The connector pin or cable colour allocation for the connection to each package type is shown on the
appropriate outline drawing. Refer to the relevant datasheet.
Interface
There is no protection against reverse polarity power connection. Users must observe the correct polarity
to prevent permanent damage to the sensor if the supplies are connected incorrectly.
Caution: Short circuits from outputs to either power rail may result in permanent damage to the
sensor. Limiting the power supply current to 100mA is recommended to minimise risk of damage
caused by incorrect connection.
The analog outputs for the X, Y and Z axes are buffered to give a low output impedance, enabling the unit
to be operated over long cables and interfaced to low impedance data acquisition systems.
Power supplies
The Bartington PSU1, Magmeter, SCU1 and Spectramag-6 are suitable power supply units for testing
Mag639 but they may limit the performance of the Mag639.
Bandwidth may be restricted by low-pass filters fitted within these units. Refer to the relevant data sheet
for details of filter cut-off frequencies.
Supply voltage from PSU1 and Magmeter is nominally ±12V, limiting the available output to less than the
specified ±10V; the Mag639 will therefore only work over 90% of the specified field strength with these
instruments. SCU1 and Spectramag have adjustable supply voltages
Alternatively, users may wish to provide their own supply. Refer to Appendix 1 for further information.