Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
38
•
If the dielectric constant is too high when
Focus is turned on, hyperbolic reflections
will still appear as hyperbolas.
•
If the dielectric constant is too low when
Focus is turned on, hyperbolas will
appear in a “U” shape.
•
Adjusting the dielectric with the
Dielectric control button will change how
hyperbolic reflections appear during data
collection. The goal is for all hyperbolic
reflections to appear as dots.
•
If you are on a homogenous material,
like concrete, this calibration is good for
all similar materials. If you are on soils,
this is only an approximation because the
Dielectric Constant can change greatly
with depth and across an area.
Pause/Resume - Time Mode Only
Temporarily pauses data collection in Time Mode. Press once to Pause collection. When the system is
paused, the Pause control button will become a Resume control button. Press Resume to continue data
collection.
Next Point - Point Mode Only
This is the control button that allows you to collect multiple scans in one file when collecting data in
Point Mode. When the Next Point control button is pressed a subsequent scan will be added to the data
display starting from the left and progressing to the right.
Gain
This Gain option is also referred to as display gain (see section 2.4 above for screenshots). It increases the
amplitude of your data by multiplying every sample throughout your scan by a constant value. The result
is that you will be able to better see weaker reflections, but those already strong reflections may be over-
gained. This function is useful for a quick viewing of data that is attenuated or otherwise under-gained to
guarantee that it was not clipped.
•
You can change Gain from -12 to 60, with negative values weakening the entire signal and
positive values strengthening the signal by the value shown.
•
To modify Gain press the Gain control button and use either the Control Knob or Right/Left
Arrow keys to adjust the gain amount.
•
Display Gain is only for display and is not saved with the data.
Zoom – Distance and Time Mode
This option modifies the horizontal scale by zooming in or out by factors of ½x, 1x, 2x, 4x, or 8x (see
Section 2.4 above for screenshots).
•
The system defaults to 1x Zoom on initial startup and when data collection begins.
•
This does not affect how the data are saved.
H Cursor
Adds a yellow horizontal line to the screen during data collection that can be moved or toggled On or Off.
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