ABEM Terrameter SAS 1000 / SAS 4000
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14.14
POL8X8: POLE-POLE IN 8X8 SQUARE GRID
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.
Cable A
Cable B
Cable C
Cable D
Figure.
Sketch of 8 x 8 electrode layout using 4 standard Lund cables with 21 take-outs
each. The cables are connected so that take-out 1 is closest to the instrument. Note
that every second electrode take-out on the outer cables is skipped (grey take-outs
in the sketch), and there is no overlap of electrodes between the inner and outer
cables.
This protocol file is designed for 3D surveying using the pole-pole array. Observe that every
electrode take-out is used on the two cables closest to the electrode selector, and every second
take-out used on the outer two cables. Furthermore, there shall be no overlap at the cable
joints.
Protocol
Array Type
Address File
Size .ORG
Size .UP/.DWN
POL8X8
Pole-pole
8X8
728
-
Note:
The logical arrangement of the address file in this case is such that it appears as 8 parallel
cables to the data acquisition software, i.e. electrode 1-8 in the sketch appears as cable 1,
electrode 9-16 appears as cable 2, etc.. Observe that in this case it does not match the labelling
on the cables at all! The address file describes the physical configuration of the cable, and
how the electrode take-outs are wired to the internal addresses of the relay switch, and can as
in this case be used to arrange cables in a different way than originally intended. Note also
that the protocol file in turn only refers to the electrode numbers.
