abem Terrameter LS Instruction Manual
Also see for Terrameter LS: User manual
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Contents
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ABEM Terrameter LS102Note that the pins 22-32 in the standard cables with 21 take-outs each are notconnected to any electrode take-outs, but used for linking every second take-out onthe outer electrode cables to the Terrameter / Electrode Selector via the cable joints.12.11 Protocol Files in ORG-formatThe format of protocol files in the system used by older versions of the ABEM LundImaging System is presented here for reference since one way of creating an XML-format protocol file is to convert from this format. The first station (midpointposition) is always measured using a protocol file with .ORG filename extension.Consecutive stations use .UP or .DWN protocol files depending on if the roll-along isdone towards higher or lower coordinates. The .UP or .DWN files are reducedaccording to the possible data overlap with the previous station, to avoid measuringthe same data points twice. This also means that measuring is normally much fasterfor consecutive stations at a roll-along than for the first. Terrameter LS automaticallyreduces the measurements at consecutive stations for overlap with measurementsalready taken at previous stations, so it is only necessary to convert the ORG-fileIf 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 WennerCVES with long and short layouts. In this case one of the files should be reducedaccordingly.The protocol files contain an array code, the address file used followed by a commentstring, and the logical positions of the electrodes. The positions are given for thecurrent electrodes followed by the position of the potential electrodes. The format isthus: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)where the electrode positions are given as integers in the interval 1-ntot. If remoteelectrodes are used these positions are specified as zero.The array codes are used mainly for presentation purposes, and in the case of pole-pole and pole-dipole how the contact test is performed. The array codes used forTerrameter LS are compatible with Res2dinv, and they differ from what is used byTerrameter SAS1000 / SAS4000. The following codes are defined:ElectrodeArrayArrayCodeCode in OldSystemResistance 0 0Wenner-α 1 1Pole-Pole 2 4Dipole-dipole 3 5 |
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