7
EM61MK2 Data Logging System (DAS70/61MK2)
The EM61-MK2 readings are updated approximately 10 times per second during monitoring session.
If
Mode 4
was selected on the instrument panel channels
1
,
2
,
3
, and
4
will be displayed, and when
Mode D
was selected (for Top and Bottom antennas) channels
1
,
2
,
3
, and
T
will be given in the
Monitoring menu. The level of the instrument battery is continuously updated (Bt:) in Volts. Battery
voltage is followed by label Mkr: which indicates state of the fiducial marker. When fiducial marker
is pressed then
Y
is displayed, otherwise label Mkr: is followed by
N
.
When GPS was Disabled in the Set Port for GPS menu a message GPS Disabled will be displayed.
If the GPS port is Enabled and a working GPS system is connected to the field computer the
Monitoring screen will display a few more parameters, as presented below.
In the above Figure one line of the display is dedicated to show the GPS status. A label
DGPS
(Differential Global Positioning System) indicates that GPS readings are differentially corrected in
real time, while label
AGPS
(Autonomous Global Positioning System) indicates lack of differential
correction. On the right side of
DGPS
or
AGPS
label small square is displayed. This square should
move down and up with the frequency of GPS update rate (usually 1 second intervals). If the
square is not moving for long periods of time it means that the GPS system is not working or that
it is not connected to the field computer. The next label
P
with a value varying between 0 and 99.9
represents an index called Position Dilution of Precision (
PDOP
). The last label
S
and following
number shows number of currently tracked satellites. Refer to section 9 (Set Port for GPS), Appendix
A, and to GPS manuals for more information about GPS parameters.
A list of program functions available directly from the Monitor/Null menu is given at the botom
of the screen. The screen (presented below) containing all available options is displayed after key
?
or
H
is pressed. Available options are as follows:
N
- Nulling,
I
- Internal Q-coil calibration,
E
-
External Q-coil calibration,
M
(or
V
) - displays field computer available memory,
B
- displays field
computer battery level (may not work correctly for loggers other than Allegro or Pro4000), key
<
del
> is available only in StandBy mode (see section 12), the function key
F2
- exits the Monitor/
Null menu.
Summary of Contents for EM61MK2A
Page 2: ......
