GDP-32
II
INSTRUCTION MANUAL
January 2003 Section 8, Page 2
8.1 INTRODUCTION
PROGRAM DESCRIPTION
The Resistivity-Phase Induced Polarization (RPIP) program is an enhanced frequency domain
program using synchronous stacking, averaging, and Fourier integration to improve signal to
noise ratio.
Refer to Section 6 – Receiver Setup for information concerning calibration, synchronization,
generic screens and field parameters for all survey programs. Refer to the end of this section for
suggestions for field measurement receiver connections.
FREQUENCY RANGE
The standard frequency ranges from 0.015625 Hz (0.016 Hz in the calibration tables) to 8192
Hz.
FILTER
The RPIP survey program has a digital telluric filter, also referred to as a Moving Average
(MAV) filter, for rejection of low frequency tellurics. This filter is active for frequencies from
0.015625 to 1.0 Hz.
CALIBRATION CACHE
Calibration data for the RPIP Survey Program are stored in the Frequency Domain Calibration
Cache.
NOTE: The CSAMT Survey Program also uses the Frequency Domain Calibration Cache.
Overwriting calibration data in this cache causes CSAMT calibration data to be lost. However,
the RPIP and CSAMT calibration data should be identical.
PHASE
The RPIP survey program measures the absolute phase shift between the transmitted signal and
the received signal.
For normal operations at low frequencies, the real-time phase shift should be in the range of 0 ≥
φ ≥ -200 milliradians. If the phase is closer to π radians (3142 mr) the receiver or transmitter
leads are probably reversed. Remove the π radians of phase shift by either reversing the
transmitter wires at the transmitter, or reversing the leads to the receiver channel in question. For
multi-channel receivers, it is easiest to make the change at the transmitter, and then maintain the
same polarity throughout the survey.
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