Introduction To Mag628, Mag629 And Mag669; Vector Measurements And Conventions - Bartington Mag628 Operation Manual

WARNING: The casing of the Mag629 electronics module is constructed from chromate
coated aluminium, which is then covered with pale grey epoxy. The grey paint covering
prevents contact with the chromate coating as this may contain up to 4 milligrams of
Hexavalent Chrome (Cr(VI)) per instrument. Hexavalent Chrome is considered a serious
hazard to human health, particularly if inhaled or ingested.
WARNING: Under no circumstances should the electronics enclosure be deliberately
modified, for example by sanding, drilling, abrading, machining, etc. as this could
potentially cause a risk to health.
WARNING: If a Mag629 electronics module has been damaged to the extent that the
grey epoxy coating has been penetrated, avoid contact and consult your local hazardous
materials handling expert. Familiarise yourself with current best practice in dealing
with hazardous materials, in particular the use of the correct PPE (Personal Protective
Equipment).
WARNING: Under no circumstances should the electronics enclosure be disposed of in
normal waste. Dispose of hazardous waste according to local regulations.

3. Introduction to Mag628, Mag629 and Mag669

The Mag628, Mag629 and Mag669 three-axis fluxgate magnetometers are designed specifically
to meet the environmental requirements of aerospace applications, with applications such as
vector compensation in airborne magnetometry. Refer to the product brochure for specifications.
The two-part construction consists of a sensor head assembly with integrated cable and
a separate electronics module. The sensing head contains the three concurrently sensing
fluxgates arranged along X, Y and Z axes. The electronics module carries processes and outputs
the signals, and also provides a monitor signal output to warn of power supply faults.
The sensor head is fully sealed and may be installed in exposed situations. It and the Mag629
electronics enclosure can withstand high levels of shock and vibration, dust, humidity, corrosive
atmospheric conditions, acoustic noise and electromagnetic fields, whilst operating within a wide
range of both temperatures and pressures.
The electronics of Mag628 and Mag669 are un-encapsulated and must be installed within the
customer's electronics enclosure to provide environmental and EMC protection.

3.1. Vector Measurements and Conventions

Each magnetometer produces three independent analogue output voltages in response to the
magnitude and direction of the orthogonal components of a magnetic field. A 'right-hand' co-
ordinate system is adopted. In this system the X, Y and Z axis correspond to the thumb, first and
second finger respectively of the right hand. By convention, the magnetometer should be
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