TeeJet SmartPad II, User Manual

Page: 81 / 198

SmartPad II
Software Version 4.02
Chapter 3 - Real-Time Guidance 3-27
Lightbar Setup
Drive Sensitivity
The Lightbar Menu item, Drive Sensitivity, allows you to set the distance you would like a single light on the Smart-
Pad II Lightbar to represent. If a value of 1.5 feet is entered, then each light on the lightbar will be equal to 1.5 feet.
This allows you to quickly determine how far off the guideline you are. If the second light to the right of the “stacked”
center light is illuminated, then the vehicle is approximately three feet to the right of the guideline and you need to
turn the vehicle back to the left to get back on line. Figure 3-34 shows the lightbar (Display Mode = Swath) with a X-
track error of 2.3 ft. When determining what value to enter into the menu field you must consider the accuracy of the
GPS/DGPS system you are using. Different DGPS sources provide different position accuracy. A good rule of thumb
is to set the drive sensitivity to a value slightly less than one half of the position accuracy of your DGPS receiver.
E.G., with a DGPS system that is accurate to with in 3 feet, set the Drive Sensitivity to a value between 1.2 and 1.5
feet.
To change the Drive Sensitivity value; highlight the Drive Sensitivity menu item and press . The Drive Sensitivity
dialog box will appear. Enter the desired value using the arrow keys, , once the desired value is
entered, press to return back to the Lightbar setup menu, see Figure 3-35.
Figure 3-34: Lightbar with X-Track Error
Figure 3-35: The Drive Sensitivity Menu Item