ABEM Terrameter LS
44
Connect external power supply if needed, the built-in battery pack may only be
sufficient for small low power surveys. Switch on the instrument by pressing the
power button.
The “Stop” button must be released before measuring can start in order to allow
current transmission.
Dangerous voltages and currents are transmitted by
the Terrameter via electrode cables connected to it
or an external Electrode Selector! During the entire
duration
of
an
electrode
contact
test
or
measurement session it is the responsibility of the
operator always to have full control of the entire
electrode cable layout, so that people and animals do
not get close to the electrodes and electrode take-
outs connected to the measurement cables!
6.5
2D Electrical Imaging
All CVES cables shall be rolled out in the direction of the profile, that is with the
takeout numbers increasing in the same direction as the coordinate numbers increase.
The procedure is: Secure the free cable end at the point of the lower coordinate
number and walk the reel towards points of higher coordinate numbers. It is a good
rule to have the profiles always running south-to-north or west-to-east (instead of
north-to-south or east-to-west), to avoid confusion when the results are to be
presented (unless an existing co-ordinate system demands else).
For all protocol files using the standard Lund Imaging System cable layout, of four
cables with 21 take-outs each, the procedure described below is recommended
3
. By
using this procedure, high near surface resolution towards the ends of the measured
section is achieved. This is important not only for the resolution at shallow depths, but
it also affects the resolution at depth.
At the first measurement station start laying out and connecting three cables only, and
connect the instrument between the first two cables. In the data acquisition software
these cables are designated as Cable 2, Cable 3 and Cable 4 (Figure 46), where the
instrument is connected between Cable 2 and Cable 3, and Cable 1 is excluded at the
first station.
Note!
The last and the first electrode take-outs shall overlap at
the cable ends.
3
The procedure for a set of 4 x 21 take-outs cables may appear a bit complicated at first, but it offers
significant advantages over the simpler procedure for a set of 4 x 16 take-outs cables.
Summary of Contents for Terrameter LS
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