P029 ELIMINATION OF CABLE EFFECTS WHILE MULTI-CHANNEL SIP MEASUREMENTS 1 INTRODUCTION The Spectral Induced Polarization method (SIP) measures the amplitudes and phases of the frequency-dependent electrical resistivities of rocks and sediments. Thus soil can be discriminated and characterized more detailed than by evaluating only the dc resistivities. Most SIP investigations perform profile lengths of less than 200 m and frequencies less than 1 kHz. SIP sections can be measured effectively only with multi-channel instruments. Hereby data quality strongly depends on the technical concept of the instrument. Concepts which are successfully used for dc measurements fail if ac signals of more


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