4
OPERATING MODES
Pressing the SELECT button wakes the Model 304 form the SLEEP mode. The ELEVATION
display lights showing either the default 00.00 grade elevation, or one which had been
programmed in previously. Unless power is removed, the system is never OFF.
Pressing the SELECT button cycles through the operating modes listed below. LED’s located
between the + and - buttons will light indicating the current mode.
LED’s UNLIT:
The blade and sensor elevation can be manually controlled with the BLADE and MAST
switches. The blade can also be controlled automatically.
PRESET:
Pressing the SELECT button lights the PRESET LED. The + and - buttons allow you to change
the ELEVATION window number to match a reference elevation.
SURVEY:
Pressing the SELECT again puts you into the SURVEY mode. During the survey, as the
topography changes, the sensor will move up or down the mast following the laser signal. The
ELEVATION window will show the changing elevation. The following Field Survey example
shows how the data will be recorded automatically. (For Manual or Continuous operation see
#6, in the MENU ITEMS section on page 3.)
FIELD SURVEY EXAMPLE:
Place a marker at the end of the row on which you wish to begin. Place a second marker a
measured distance, 50 feet perhaps, up the row to be surveyed. While maintaining a constant
vehicle speed, press the + button when the first marker is reached. Press it again as the send
marker is reached. Thereafter the data will be recorded at 50 foot intervals if the speed
remains constant.
After the final reading has been recorded at the end of each row, press the - button. The timer
will pause, the survey LED will pulse and the average elevation of all data collected will be
displayed. Pressing the + button to restart the timing sequence. Repeat the procedure at the
end of each row. If a printer, data recorder, or computer is attached to the Control Panel, the
data will be passed to the device. (NOTE: Data will only be taken when a center signal is
received. An incorrect elevation cannot contaminate the field survey.)
SET AUTOMAST:
The SELECT button allows the + and - buttons to preset a sensor elevation change value. See
ACTIVATE AUTOMAST for details.
ACTIVATE AUTOMAST:
When an ELEVATION CHANGE VALUE has been programmed into the Model 304, pressing
the + button will change the sensor elevation by the programmed amount. The - button will
