Geometrics G-877, Operation Manual

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1.0 INTRODUCTION TO THE G–877 MARINE MAGNETOMETER
Congratulations on your purchase of the newest member of our Marine Magnetometer family!
This document describes the basic operation of the G–877 Marine Magnetometer hardware and
software systems. We have divided the manual into sections on theory, installation, operation
and software configuration. In order to get the best performance from your new magnetometer,
it is important that you read sections 1.0 through 3.0 material in its entirety.
The G–877 Proton Precession Magnetometer is a digital device and requires that a customer or
Geometrics supplied portable laptop or desktop computer be used for recording and display of
the data. To facilitate the use of the system by those individuals new to computer use, we have
written logging/display software with a special Configuration Wizard that simplifies and
automates the setup of the computer, magnetometer and associated hardware (GPS positioning
for example). If you purchased
MagLogLite

or MagLogNT™ software (sometimes supplied
with the system) it is important that you read the MagLogNT™ manual as well as section 3.0 in
this manual on the use of the MagLog Configuration Wizard. If you are not using our software
to communicate with the magnetometer, we have included section 4.0 which discusses the
technical details of communicating with the magnetometer system.
Each of our magnetometer systems is supplied with our MagMap2000™ analysis and display
software. This program allows the user to upload the logged data files (from our logging
software or others’) and apply a variety of analytical and display features. For instance
MagMap2000 allows the user to plot out his GPS position tracks
as well as plot profiles and
color contour maps of the survey data. Anomalies in the analog style profile plots can be
flagged and their latitude - longitude positions noted in the GPS track plot and contour maps to
enable the surveyor to accurately return to the site for pinpointing locations or for additional
target analysis.
The following provides a basic introduction to magnetics in general and to recording proton
precession magnetometers specifically.
1.1 WHAT IS A MAGNETOMETER?
G–877 MARINE MAGNETOMETER OPERATION MANUAL
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