GDP-32
II
INSTRUCTION MANUAL
May 2002 Section 11, Page 10
OUT - All notch filters bypassed.
60 - 60 and 180 Hz notch filters enabled.
60,5 - 60, 180, 300 and 540 Hz notch filters enabled.
Other standard selections are:
50 - 50 and 150 Hz notch filters enabled.
50,5 - 50, 150, 250 and 450 Hz notch filters enabled.
50/60 - 50, 150, 60 and 180 Hz notch filters enabled
Hz. Frequency selection - use
Home
SELECT UP
or
SELECT DN
End
to change.
Cycle. Specify the number of cycles to average. Increments are in binary steps from 1 to
16,384. Use
Home
SELECT UP
or
SELECT DN
End
to change. As the system acquires data, the cycle count will
be updated in real-time to the left of the number input by the operator.
Tx Curr. Transmitter current in amperes.
Sta/Ant. T h e Sta(tion) field (station numbers for individual E-fields) can be changed in
Menu 4, but the Ant(enna) numbers are accessible only in Menu 3. In Menu 4, the cursor
will skip over any channels labeled with an H-field designator.
NOTE: Our standard data processing programs sort first on station number, second on
Rx and third on Tx. To ensure proper sorting in data processing the operator must make
sure the station numbers are entered properly.
G0, G1, G2. Gain stages 0, 1 and 2. In this example, all gain stages are set to unity
gain by default. Upon pressing
Enter
, the program will automatically set the gains and SP
buckout if the auto-gain mode is selected as denoted by the message at the bottom of the
screen: CONT-Set gains, ESCAPE-Prev menu. (This is the default mode).
Atn. The attenuator is bypassed (set to OUT). The other option is IN.
SP. Self Potential or offset in millivolts. Initially set to 0.00. Will be set to the actual
value upon pressing
Enter
.
GGGA. Gain settings for stages 0, 1 and 2 (in powers of 2). The attenuator setting is A, I
for IN, O for OUT.
NOTE: Some values are not registered in the computer memory until you exit the parameter
field by pressing
Pg Up
PREV FIELD
,
Pg Dn
NEXT FIELD
, or
Enter
. Exceptions to this rule are the Hz (frequency)
field and powerline notch filters. Whenever you change the frequency it is automatically
changed through the timing card. However, the anti-alias filter is not changed until just prior to
data acquisition. Upon pressing continue to gather data or set gains, the computer will
automatically set the anti-alias filter as defined by internal look-up tables.
Notice also that the battery voltage (12.3) has now been inserted between the program version
number and the date.
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