abem Terrameter LS - Induced Polarisation (IP)

ABEM Terrameter LS
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11.3 Induced Polarisation (IP)
In the case of time domain IP measuring one positive and one negative current pulse
is usually employed. It is then necessary to measure the background levels before and
after the measuring cycle, and use that for removing drift during the measuring cycle.
Failure to do so can lead to magnitude higher measurement errors in the measured
resistivity data. (Figure 107)
Period
Current
Voltage
Measuring intervals
Figure 107. IP measuring cycle timing definitions