GDP-32
II
INSTRUCTION MANUAL
January 2003 Section 10, Page 2
10.1 INTRODUCTION
This Fourier transform based program forms the basic complex resistivity (CR) program for field
and laboratory multifrequency IP measurements, and can also be used for harmonic CSAMT,
frequency EM, MMR, and other programs using magnetic field sensors. This is an enhanced
program using synchronous stacking and averaging, in addition to Fourier transform methods to
improve the signal to noise ratio.
The frequency range of the CR program is from 0.015625 to 9216 Hz. Complex resistivity (IP)
measurements are commonly made using the fundamental frequencies of 0.125, 1.0, and 8 Hz to
acquire magnitude and phase information from 0.125 to 72 Hz.
Access to the analog board calibrate buffer is labeled 5) CR CALIBRATE in the ACCESS
CACHE.
The operator can choose channel designations of Ex, Ey, Ez, Hx, Hy, Hz, and Ref (for current
referenced CR). If a magnetic channel is specified, (Hx, Hy, Hz), the program will deconvolve
the measured results with the contents of the calibrate buffer in the ACCESS CACHE labeled
6) CR ANTENNA CAL. This permits the user to incorporate the calibration values of the
magnetic sensors being used. The program has an HACSAMT (harmonic CSAMT) option as
well as provision for FEM and MMR measurements using the HACALS calibration buffer.
The program has a digital telluric filter, which we call a moving average or MAV filter, for
rejection of low frequency tellurics. This filter is installed for frequencies from 0.015625 to 1.0
Hz.
This manual is written in generic form for eight channels. If your receiver has more or less than
eight channels, only information for the number of channels contained will be displayed.
Go to Section 6 of the receiver instruction manual for information concerning calibration,
synchronization and generic operation of all programs.
Go to the end of this CR program manual for suggestions on connecting the receiver for field
measurements.
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