41
GSM19 Series Magnetometers - Version 7
GEM Systems, Inc. Advanced Magnetometers
For more technical information, visit www.gemsys.ca
•
auto-tune yes
allows the unit to follow changes in the magnetic field with jumps of a maximum
of +-2.5
μ
T per reading in the survey area.
•
auto-tune no
permanently holds tuning at the initial value. If
tune initialize
was set to YES, the
tuning value obtained during the automatic scan is set for the survey. If
tune initialize
is set to
NO, the unit retains the tuning value displayed on the next screen
To store your selection press
F-ok
. If you selected
tune initialize no
at screen 22, the following
screen is displayed.
SCREEN 24
57
tuning 19-131 microT
F-ok C-change-number
Enter the first two digits of expected magnetic field (first 3 if above 100 kgamma) for initial tuning.
5.3.9 Using the AC-Filter
In the
Survey Menu
, press
F
to highlight
AC filter
.
SCREEN 25
survey mode position time file
cycle time tuning
AC filter
display mode text ID
60Hz
A-start C-change
←
BF
→
C-change
toggles between 60Hz, 50Hz and No.
If you select
No
, the reading is defined as the
longest measurement possible, however, the other two
settings are recommended because of possible AC interference.