Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
19
Effects of Changing Dielectric, Soil Type, Depth Range, or Time Range
Changing either Dielectric, Soil Type, Depth Range, or Time Range will affect other settings during setup,
data collection, and playback. Below are two charts showing how a change will affect the other settings.
During Setup:
When a value is being changed the effects will not appear in the other settings until Enter
is pressed. Prior to changing settings verify that you have the appropriate Vertical Scale selected.
Vertical
Scale
Setting
Changing the
Dielectric or Soil Type
Changing the
Time Range
Changing the
Depth Range
Time
- Depth Range changes.
- Time Range: no change.
- Depth Range changes.
- Dielectric or Soil Type: no
change.
Dielectric changes, Soil
Type becomes Custom.
Time Range: no change.
Depth
- Time Range changes.
- Depth Range: no change.
Dielectric changes, Soil
Type becomes Custom.
Depth Range: no change.
Time Range changes.
Dielectric or Soil Type does
not change.
During Data Collection (Depth Calibration/Hyperbola matching) and Playback:
Vertical
Scale
Setting
Changing the
Dielectric
Changing the
Time
Changing the
Depth
Time
No visual effect.
Time Parameter cannot be
changed during collection.
Dielectric changes when a
known depth is entered.
Depth
Depth Range changes as
Dielectric is changed.
Time Parameter cannot be
changed during collection.
Dielectric changes when a
known depth is entered.
Position Mode
This option controls the position of the beginning of the time range (0 ns). This is the start of the recorded
scan trace. Typically, having the system auto locate itself is sufficient to adequately set the position
during data collection. However, you can also manually adjust this location. Toggle between the two
options, Manual or Auto, by pushing the Control Knob or the Enter button.
Manual:
Allows you to set an Offset and Surface %. Offset is the time lag between the initial pulse and
when the signal first leaves the antenna. Surface % is a visual shift in the scan to begin at the initial
reflection. When switching from Manual back to Auto the system will automatically reset the position of
0 ns based on the Surface % selected.
Auto:
Anytime the antenna is re-initialized, as when pressing the
Init
button or first entering the Setup
Collect Screen, the SIR 4000 will set the Position automatically.
•
For most applications and surveys, to acquire an accurate Position using Auto Mode the antenna
should be placed on the surface to be scanned prior to entering the Setup Collect Screen.
•
This choice is automatically set to Manual with sample densities of 4096, 8192, or 16384.
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