Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
63
Step 3: Survey Wheel Calibration
This is a critical step in 3D file collection because proper positioning of your data is essential for coherent
3D data. In order to accurately track distance when switching between different carts, or moving from one
type of terrain to another, you should recalibrate the survey wheel. To manually calibrate the survey
wheel, you will need to lay out a measured line on your survey surface. It can be of any length, but the
longer the line, the more accurate the calibration.
1
Select Calibrate SW from the System Menu.
2
Begin by selecting Quadrature as the Survey Wheel Mode.
3
Select calibration distance – The default distance is 10
meters or feet. However this distance can be changed. The
longer the calibration distance the more accurate the
calibration.
4
Position Antenna on the Start mark – The antenna or system
can be positioned anywhere at the start as long as you use
the same point on the antenna or system when you stop.
5
Press the Start button – This is the green Start button located
on the keypad of the SIR 4000.
6
Move antenna to the stop mark – This should match the
same location on the antenna or system where you started.
7
Press Stop button – This is the red Stop button located on
the keypad of the SIR 4000.
8
Repeat steps 3-6 at least twice to ensure that the calibration distance is consistent.
If necessary you can manually enter the calibration value:
1
Use either the Control Knob or Arrow keys to navigate to the New Calibration Value box.
2
Press the Control Knob of the Enter key to highlight the New Calibration Value box.
3
Rotate the Control Knob or use the up and down arrows to enter in the correct value.
4
Click the right arrow to save and exit.
Note:
The SIR 4000 saves the survey wheel encoder calibration value in counts/meter no matter
your selected units of measure. That means that if you are used to working in English (Imperial)
units and are familiar with a Model 620 tow-behind wheel calibration value of ~127/ft, the new
calibration value you will see will be ~417.
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