Zonge GDP-32 - Page 321

GDP-32
II
INSTRUCTION MANUAL
October 2002 Section 15, Page 10
LINE number in Menu 2 is used by data processing programs as a grid coordinate, in a
direction perpendicular to the survey line.
The Tx and Rx fields are used as survey parameters by data processing programs.
Whenever Menu 1 is accessed, the Ax and Bx values will automatically set Tx = AB/2
and Rx = Ax + AB/2 = receiver location.
The operator may change the AB/2 value in the Tx field while in Menu 4, rather than
returning to Menu 1, in order to increase the survey speed. The Rx value will not be
changed during a sounding, unless the operator returns to Menu 1, resulting in Tx and Rx
being automatically updated.
The data acquisition program will always use the value of Tx = AB/2 for resistivity
calculations.
An example of a SCHLUMBERGER setup:
Let the AB transmitter dipole be 1000 meters long, the starting potential dipole spacing = 10 m,
and we want to measure 3 potential dipoles simultaneously with logarithmic spacing: 10 m, 30 m
and 100 m.
The data would be input as follows:
Menu 1: Menu 2: Menu 4:
Ax = 1000 A-Sp = 10 meters CH N
Bx = 0 1 ON 1
2 ON 3
3 ON 10
An example of a WENNER setup using the Schlumberger program:
Let the AB transmitter dipole be 90 meters long, then the potential dipole spacing will be 30 m.
The data would be input as follows:
Menu 1: Menu 2: Menu 4:
Ax = 90 A-Sp = 30 meters CH N
Bx = 0 1 ON 1