GDP-32
II
INSTRUCTION MANUAL
May 2002 Section 6, Page 36
OPTION 4 – CLEARING GAINS AND SP
In addition to automatic and manual gain setting, the operator can set all gains to unity with the
gain-setting routine.
1. From the Data Acquisition Screen, press to view the gain setting menu.
2. Press , “Clear and unfix all gains and SP.” The receiver then sets the following:
Gains to “1”
Attenuators to “OUT”
SP buckout to 0.0.
Removes any Fix Flags on the gain stages and the attenuator.
The receiver displays these values on the screen, and then returns to the Data Acquisition Screen.
OPTION 5 – ADJUSTING SP OFFSET
Figure 6.7(d) shows the signal voltage in an area experiencing SP drift. This can be avoided by
adjusting for SP so that a non-zero SP does not restrict the maximum gains and reduce the A/D
resolution. This process should be completed before setting gains, when in the manual mode.
SP adjusts for a DC effect, so powerline notch filters can be included at any setting. The SP
adjustment can be made with the transmitter on or off, when in the manual mode.
One of the SP-offset options is in the gain-setting routine.
From the Data Acquisition screen, press
to enter gain setting mode.
Press . Wait momentarily until the receiver displays the SP offset parameter (in
millivolts) for each channel.
NOTE: SP adjustments can be made at any time by pressing the key.
OPTION 6 – NOISY/STANDARD GAIN MODE
Figure 6.7(b,c) are examples of noisy and very noisy field signals. Option 6 sets the gain modes
to NOISY or STANDARD. NOISY is the default mode for all programs except TEM.
To enable NOISY or STANDARD gain mode:
Press gain to view the Gain Setting menu.
If NOISY gain mode is enabled, Option 6 reads:
6) Turn off noisy gain mode
Press
to enable STANDARD gain mode. The receiver then returns to the Data
Acquisition screen.
If STANDARD gain mode is enabled, Option 6 reads:
6) Turn on noisy gain mode
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