Specifications

University of Pretoria etd – Combrinck, M (2006)
Figure 5-8: Comparison of SDTC filter only (top) and SDTC with additional noise filter
(bottom). Black dots are station elevations (DTM) and white dots represent depths at which
conductivities are calculated.
5.2.4 Comparison of 25Hz (high, H) and 6.25Hz (medium, M) base frequency data
The high frequency time channels range from 0.088ms to 6.978ms and the medium
frequency channels from 0.35ms to 27.92ms. The first 14 channels of the medium
frequency overlap with the last 13 of the high frequency. Measuring at these two
frequencies therefore increases the coverage of the decay curve in terms of time, but also
provides a check on the quality of data in the overlapping region. Often one frequency
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