ABEM Terrameter SAS 1000 / SAS 4000
- 61 -
ntot adr
ntot
cable
ntot
-pos
ntot
{ number, internal address and physical position of last take-out }
For line oriented cable arrangements with roll-along in the direction of the cable the
parameters
n
y-move
and
n
x
are not specified, but only for areal cover and 3D cable
arrangements. In these cases the parameter
n
x-move
is set to zero. Excluded electrode positions
can be entered into the address file by assigning the address 0 (zero). These electrode
positions will then be omitted from electrode contact test and measuring. Example address
files can be found in “Appendix E. Address and Protocol Files” (page 90).
The physical connection between the multi-pole connectors and the internal relay addresses
is:
The pins 22-32 in the standard cables are not connected to any electrode take-outs, but used
for linking every second take-out on the outer electrode cables to the Electrode Selector via
the cable joints. There is an overlap between the connectors, where connector three is
connected to the addresses connected to pins with numbers higher than 21 in connectors one
and two. This means that cable joints should not be used when a cable is connected to multi-
pole connector three on the ES 464.
Protocol Files
The protocol files specify the measurement sequence, and can be designed to do
measurements using arbitrary arrays.
The first station (midpoint position) is always measured using a protocol file with .ORG
filename extension, whereas consecutive stations use .UP or .DWN protocol files depending
on if the roll-along is done towards higher or lower coordinates. The .UP or .DWN files
should normally be reduced according to the possible data overlap with the previous station,
to avoid measuring the same data points twice. This also means that measuring is normally
much faster for consecutive stations at a roll-along than for the first.
If more than one protocol file is used for each station there is also a possible overlap, between
the protocol files at the same midpoint, as for example when doing Wenner CVES with long
and short layouts. In this case one of the files should be reduced accordingly.
The protocol files contain an array code, the address file used followed by a comment string,
and the logical positions of the electrodes. The positions are given for the current electrodes
followed by the position of the potential electrodes. The format is thus:
code
[arraystring]
addressfile
[commentstring]
Apos(1) Bpos(1) Mpos(1) Npos(1)
Apos(2) Bpos(2) Mpos(2) Npos(2)
...
Apos(n) Bpos(n) Mpos(n) Npos(n)
Connector
Pin Numbers
Internal Addresses
1
1-32
1-32
2
1-32
33-64
3
1-21
54-64, 22-32
Table 8-1: The physical connection between the three ES 464 connectors and the internal
relay addresses. The ES10-64 is only equipped with connector 1 and connector 2,
hence an adapter is needed for connecting three cables to it.
