Great Plains V-300F Operator Manual - Manual (Page 49)

6/29/2006 148-057M
47 Monitor Operation
Forward Speed Alarm
If you stop while the drill is in work or move at a speed less than 1.6
miles/hr (2.6 km/hr), then the instrument will beep twice, and the dis-
play will alternate between the currently selected channel and the
forward speed channel.
The alarm continues until the speed is increased above the alarm
threshold.
NOTE: The forward speed alarm can be disabled in program mode 2.
Speed Sensor Calibration
The forward speed sensor is magnetically operated and senses the
land wheel rotation. In order to display the correct speed and accu-
mulate area correctly, the instrument must be programmed with the
correct Speed Sensor Factor (SSF). This is the distance traveled be-
tween two signal pulses received from the sensor.
The S.S.F. can be calculated theoretically and then manually pro-
grammed, or the instrument can automatically calculate it via the
“Autocal” function.
Manual Speed Calibration
The theoretical calibration figure is 127.4 inches if the instrument is
set for imperial units, or is 3.235 meters if it is set for metric units.
Default = 78.78 inches (2.000m)
NOTE: An ‘Autocal’ is more accurate in field conditions
1. Select the channel.
2. HOLD to enter program mode 1. The top/bottom
horizontal segments indicating metric/imperial units are dis-
played briefly before the calibration factor appears. Continue
holding the button and…
3. PRESS to select the digit or decimal point to change.
4. HOLD to change the selected digit (or move the
decimal point).
5. RELEASE to select the next digit and repeat as
above, otherwise simply release both buttons. The instrument
will then return to the normal display mode.
1 2
2
3
4
Enter Cal Mode 1 (S.S.F)
Change S.S.F.