OM2240 Operation Manual for Mag639 Three-Axis Fluxgate Magnetometer Specifications may be subject to slight alteration without prior notice. This system is not qualified for use in explosive atmospheres or life support systems. Consult Bartington Instruments for advice. The copyright of this document is the property of Bartington Instruments Ltd.
BARTINGTON INSTRUMENTS Table of Contents Table of Contents ................................................................................. 1 How to use this Manual........................................................................ 3 Symbols Glossary .......................................................................... 3 Waste Electrical and Electronic Equipment (WEEE) Regulations ......... 3 Introduction to the Mag639 .................................................................
BARTINGTON INSTRUMENTS Calibration................................................................................... 10 End of Life Disposal............................................................................. 10 Accessories ......................................................................................... 11 PSU1 and Magmeter Power Supply Units .................................. 11 Spectramag-6 Data Acquisition System ...................................... 11 SCU1 Signal Conditioning Unit .
BARTINGTON INSTRUMENTS How to use this Manual This document describes the installation, operation and maintenance of Mag639 Magnetic Field Sensor. Take the time to get well acquainted with your purchase by reading this manual. Knowing and understanding your sensor will ensure you experience the most reliable operation. When service or maintenance is required, contact the Bartington Instruments service team*. Technical specifications for this product can be found in the appropriate datasheets.
BARTINGTON INSTRUMENTS Introduction to the Mag639 The Mag639 is a magnetometer consisting of a cluster of three, feedback stabilised, fluxgate sensors arranged along X, Y and Z axes. Each axis provides a highly linear magnetic response with low hysteresis and low cross talk between axes. Mag639 is ideal for use in electromagnetic (EM) survey systems (e.g. TDEM and MT) where its extra frequency response can increase overall system sensitivity. The standard Mag639 has a pre-fitted circular connector on a 2.
BARTINGTON INSTRUMENTS 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
BARTINGTON INSTRUMENTS Pre-Installation Tests Prior to the installation of the system, the magnetometer, cable and power supply must be fully tested to ensure correct function as follows: Caution: Take care to avoid bending, or otherwise damaging the contacts whilst conducting the tests. Caution: Carefully check for correct connection before applying power. Applying incorrect polarity or power to output connections may cause irreparable damage to the sensor.
BARTINGTON INSTRUMENTS Using the Mag639 Cabling It is recommended that the connecting cable to the sensor is an eight-core screened cable. Two cores will be used for positive and negative power supply lines, three cores for output signals, one core for signal common and one for power supply ground. The screen should be connected to supply ground at the supply end only. The capacitance between cores should be less than 200pF per metre.
BARTINGTON INSTRUMENTS Performance Signal Processing For different applications it may be necessary to process the signal from the sensor in different ways: In order to increase the sensitivity of the recording system it may be necessary to back-off the earth’s field and amplify only the changes in the field from the current value. This requires a high-pass filter, which could be a simple capacitively coupled arrangement or a multi-pole filter to provide a steep roll off characteristic.
BARTINGTON INSTRUMENTS Troubleshooting The Mag639 is unlikely to suffer any defects in normal use: no internal components are serviceable. The most likely causes of failure, and their solutions, are detailed in the following table: Cause of failure Solution* Power Supply Check the power supply as detailed in PreInstallation Tests Check the power. Cables Check the cables as detailed in Pre-Installation Tests Test the cables.
BARTINGTON INSTRUMENTS Care and Maintenance No repair or servicing is possible with the Mag639. For further information, refer to the section on Troubleshooting. Cleaning the Mag639 Use water and mild soap to remove grime from external enclosures. Caution: Never use chemicals, such as solvents, when cleaning the Mag639. Caution: Take particular care when cleaning around electrical connections. Bent or damaged pins may cause the magnetometer to malfunction.
BARTINGTON INSTRUMENTS Accessories This section introduces the accessories currently available for the Mag639 range of sensors. Note: All the following units are optional items. To purchase, email sales@bartington.com or telephone the Bartington Instruments sales team on +44 (0) 1993 706565. PSU1 and Magmeter Power Supply Units Performance of the Mag639 is limited when used with PSU1 and Magmeter. • Bandwidth is restricted by low-pass filters fitted within these units.
BARTINGTON INSTRUMENTS Appendix 1 Use of Alternative Power supplies Bartington power supplies provide the most suitable methods for connecting to and operating your sensor. If you have decided to use an alternative the information in this Appendix is important. Caution: Failure to follow these instructions may result in incorrect sensor readings and in some circumstances may cause irreparable damage to your sensor. Mag639 does not incorporate any reverse supply polarity protection.
Bartington Instruments Limited T: +44 (0)1993 706565 5, 10 & 11 Thorney Leys Business Park F: +44 (0)1993 774813 Witney, Oxford, OX28 4GE, England. E: sales@bartington.com The specifications of the products described in this brochure are subject to change without prior notice. Bartington® is a registered trademark of Bartington Instruments Ltd. www.bartington.
