GDP-32
II
INSTRUCTION MANUAL
January 2003 Section 10, Page 4
We will use the Reference CR mode as the example of how to set up the receiver with the
various menus in the following pages.
Array type. Six types of arrays are selectable with the
Home
SELECT UP
or
SELECT DN
End
keys:
Dipole-Dipole D-D
Pole-Dipole P-D
Schlumberger Sch
Gradient Grd
Pole-Pole P-P
Downhole D-H
Core Sample LAB
When the HACSAMT option is chosen, the following array type is set automatically:
Harmonic CSAMT AMT
If Gradient or Schlumberger arrays are chosen, then the additional two lines Ax
location and Bx location appear in the menu. These are the transmitter current
electrode locations.
If the downhole array type is chosen, resistivities will not be calculated or displayed.
Shunt. The value of the current sense resistor must be input here in order for the CR
program to calculate the output current of the transmitter when using the REF channel.
Values of current sense (shunt) resistors for standard GGT-series transmitters and the
laboratory setup are as follows:
GGT-2.5, GGT-3 0.100 Ω
GGT-5, GGT-6, GGT-10 0.100 Ω
GGT-20, GGT-25, GGT-30 0.050 Ω
ZT-30 / ZT-20 0.100 Ω
NT-20 1.000 Ω
LABROX 0.100 KΩ to 9999 KΩ
NOTE: The Shunt prompt is not displayed for the non-reference CR mode.
Gain Mode. The default mode is "Noisy", which limits the gains to obtain a maximum
voltage of 1.0 Volts, leaving lots of headroom for SP drift and random noise spikes. The
other option is "Standard", which adjusts the gains for a maximum voltage of 2.25 Volts.
See Section 6.
Units. The operator can select meters or feet. The default is meters.
Moving Average Filter. This is a telluric filter used for the frequency range of
0.015625 to 1.0 Hz. The default mode is Enabled, but the filter can be Disabled for
research applications.
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