103
GSM19 Series Magnetometers - Version 7
GEM Systems, Inc. Advanced Magnetometers
For more technical information, visit www.gemsys.ca
The VLF Survey Mode also has a correction for the tilt level of the VLF sensor for up to 10
o
from
the horizontal plane. When the VLF sensor is tilted more than 10
o
, the computation process stops
and the following message appears on the display (until the tile is corrected):
SCREEN C10
24.0 kHz Tilt ? 14 15
←
V
A-menu 1-repeat (same position)
L 00100N S 00112.50 E
14
deviation of the sensor from the vertical in the X direction in degrees
15
deviation in the Y direction
←
,
→
,
Λ
, V
show the direction the sensor should be rotated to correct the tilt
C4. SIGN CONVENTIONS FOR IN-PHASE (IP) AND OUT-OF-PHASE (OP)
Measured components are vertical in- and out-of-phase relative to the total horizontal field. Rising
magnetic field in the direction the operator is facing is considered positive, while decreasing
magnetic field is considered negative.
1.
If station has coordinates N NE E SE and the station increment is positive, signs for
IP
and
op
are not changed.
2.
If station has coordinates N NE E SE and station increment is negative signs for IP and op are
inverted.
3.
If station has coordinates S SW W NW and the station increment is positive, signs for IP and
op are inverted.
4.
If station has coordinates S SW W NW and the station increment is negative, signs for IP and
op are not changed.