Survey data correction procedures
ENVI-MAG Manual A5-15
Operation
Survey data correction procedures
The purpose of data corrections is to remove diurnal and micro-pulsation effects
of the Earth’s magnetic field. This gives you the cleanest data possible for inter-
pretation. However, these procedures may not be necessary, if your goal is only
target identification (anomaly hunting). Please refer to Section 2 - Applications,
for a more thorough discussion on this topic.
Using base-station data
You can only use base-station data when you have selected one of the advanced
(5–7) survey configurations. This procedure describes the correction when using
ENVI-MAG only. The correction with different instruments must be done indepen-
dently on a computer.
Caution: The base-station correction physically modifies the data of the mobile
units, but does not alter the base-station’s data. Please make certain
that the Base Field value in the field unit is correct before proceeding.
To correct your data, proceed as follows:
1. Connect the units as shown.
Figure A-40
Connections for the Base-station correction.
Field ENVI-MAG
Base Station
ENVI-MAG
Null Modem
(part no. 210 154)
RS-232 Cable (part no. 745 081)
RS-232 Cable (part no. 745 081)
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