abem Terrameter LS, Instruction Manual

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ABEM Terrameter LS
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transmission electrode pair. The instrument software optimises the use of measuring
channels so that as many measurements as possible are taken simultaneously for each
measuring cycle, given the capability and limitations of the relay switch. The
maximum efficiency is achieved if the electrodes of the receiver channels are
distributed between the relay cards rather than all being concentrated to one relay
card.
[FN2]
Input for the measuring channel optimisation is what is written within a <Measure>
section in the XML format measuring sequence (protocol) file (see Appendix C.
Spread and Measuring Sequence Files, for details). If all receiver pairs can be
measured within one current transmission that will be done, but if necessary
measuring will be divided on two or more rounds. Hence, it is allowed to list more
receiver combinations than there are measuring channels in the instrument within one
<Measure> section.
The measurement efficiency will of course be dependent on for example how many
measurements there are per current electrode pair, and with a multi-channel
instrument multiples of 4 measurements are optimal (4, 8, 12 etc).
The present status of the relay switch can be viewed in a table in the relay switch
status
Tab (Figure 36.).
Figure 36. Relay switch status view
4.5.1 The External Relay Switch(es)
If more than 64 electrodes switching capability is required one or more external relay
switching units (electrode selectors) of type ES10-64 can be connected. In case more