Specifications

BARTINGTON INSTRUMENTS
Page 4 of 12 M2240 ISSUE 1
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 2.5m lead. A mating connector is supplied for
the customer to connect to their own equipment
Vector Measurements and Conventions
The magnetometer produces three independent analog 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 installed so that the X axis is arranged to point North,
the Y axis to point East and the Z axis to point down.
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.