Overview; Vector Measurements And Conventions - Bartington Mag900 Operation Manual

BARTINGTON INSTRUMENTS

4. Overview

The Mag900 & Mag901 consists 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 crosstalk between axes. These characteristics, combined with the
compact design and very low power consumption, make this product ideally suited for perimeter
surveillance with a multi-sensor network.
Internal regulation of the power supply ensures the Mag900 & Mag901 is suitable for battery
powered operation, over both long and short cables (subject to the minimum supply voltage
specified in datasheet DS4550).

4.1. Vector Measurements and Conventions

Each sensor produces three independent analogue output voltages in response to the magnitude
and direction of the orthogonal components of a magnetic field. A "right-hand" coordinate
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.
East
+Y
1st Finger
North
+X
Thumb
Down
+Z
2nd Finger
Figure 1. The "right hand" tool
The centres of the three vector sensors are superimposed. Refer to outline drawing DR4576 for
the orientation of each sensor and the centre of the sensing elements. The point of each vector
arrow in DR4576 indicates the positive direction of each axis.
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