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Bartington Mag690 Operation Manual

Three-axis fluxgate magnetometer
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Operation Manual for
Mag690 Three-Axis Fluxgate Magnetometer

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Summary of Contents for Bartington Mag690

  • Page 1 Operation Manual for Mag690 Three-Axis Fluxgate Magnetometer...

  • Page 2: Table Of Contents

    BARTINGTON INSTRUMENTS Table of Contents 1. About this Manual 1.1. Symbols Glossary 2. Safe Use 3. Introduction to the Mag690 3.1. Vector Measurements and Conventions 4. Installing the Mag690 4.1. Siting the Magnetometer (Environment Recommendations) 4.2. Connection Recommendations 4.2.1. Connector Pin Allocation 4.2.2.
  • Page 3 BARTINGTON INSTRUMENTS 8. Storage and Transport 9. End of Life Disposal 9.1. Waste Electrical and Electronic Equipment (WEEE) Regulations Appendix 1: Use of Alternative Power Supplies A1.1. Signal/Power Ground A1.2. Recommended Connection Method Page 3 of 16 OM2604/3...

  • Page 4: About This Manual

    It is a cost effective sensor suitable for many general purpose applications. Fully encapsulated construction ensures that the Mag690 can be used in the field as well as in a laboratory Page 4 of 16...

  • Page 5: Vector Measurements And Conventions

    The Mag690MX and Mag690U include low-cost connectors for users working in laboratories or intending to fit the sensor inside their own enclosures. The standard Mag690 has a pre-fitted circular connector rated IP67 for use in locations where the sensor will be exposed to the elements.

  • Page 6: Installing The Mag690

    The centres of the three vector sensors are superimposed. Each orientation is denoted on the magnetometer’s label. The point of each vector arrow indicates the positive direction of each axis. 4. Installing the Mag690 4.1. Siting the Magnetometer (Environment Recommendations) Note: Site the magnetometer several metres from any magnetic base rock to avoid compromising measurements.

  • Page 7: Pre-Installation Tests

    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 for details. The sensor can also mounted on the Bartington Instruments Mag-TA Universal Tripod Adaptor. See product brochure datasheet DS3140, available from Bartington Instruments, for instructions on how to do this.

  • Page 8: Post Installation Testing

    For this reason the cable should be limited to a maximum length of 600 metres. Bartington Instruments can supply cables for connecting the sensor to the PSU1, Magmeter, SCU1 and Spectramag-6. 5.2. Connecting Power Caution: Check that the polarity of the supply is correct.

  • Page 9: Response

    The output from all fluxgate sensors will contain noise from the driving electronics. For the Mag690 this noise is at 15kHz, which is well above the bandwidth of the sensors. Where low noise operation is required, a filter should always be provided to reject the noise which lies outside the band of interest.

  • Page 10: Magnetic Hysteresis

    15kHz excitation with the sampling clock of the digitizer. The level of unwanted breakthrough at 15kHz has been minimized in the Mag690 but may still cause an apparently raised noise level when sampled at low sampling frequencies without further analogue filtering.

  • Page 11: Troubleshooting

    End of Life Disposal. 7. Care and Maintenance No repair or servicing is possible with the Mag690. For further information, refer to Troubleshooting. 7.1. Cleaning the Mag690 Use water and mild soap to remove grime from external enclosures.

  • Page 12: Calibration

    BARTINGTON INSTRUMENTS 7.2. Calibration Return the Mag690 to Bartington Instruments for calibration at the recommended intervals. Refer to the Calibration Certificate for further details. 8. Storage and Transport Your sensor is a precision electronic instrument and should be treated as such.

  • Page 13: Appendix 1: Use Of Alternative Power Supplies

    BARTINGTON INSTRUMENTS Appendix 1: Use of Alternative Power Supplies Bartington Instruments power supplies provide the most suitable methods for connecting to and operating your sensor. If you have decided to use an alternative then the information in this Appendix is important.

  • Page 14: A1.2. Recommended Connection Method

    Host Local 0V Figure 2 illustrates the recommended connection method for users who do not wish to use Bartington Instruments’ power supplies. Note: Using this method is essential when using cables over 10m. The schematic shows signal and power grounds separated at the Host end. The Host is fitted with buffer amplifiers configured as Instrumentation Amplifiers (IA), which have two high impedance inputs, one connected to X, Y or Z and the other to signal ground.
  • Page 15 BARTINGTON INSTRUMENTS In this configuration there is a voltage drop due to the cable’s resistance along the power ground. Typical current is 25mA and the resistance of a 100m 24 AWG cable is 5Ω, resulting in a drop of 0.125V. Thus the reference point for the X, Y and Z outputs is 0.125V difference to the Host 0V, which is the source of power for the sensor.
  • Page 16 The copyright of this document is the property of Bartington Instruments Ltd. Bartington® is a registered trade mark of Bartington Instruments Limited in the following countries: United Kingdom, Australia, Brazil, Canada, China, European Union, India, Japan, Norway and the...

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