Exploranium GR-135, System Manual, Page: 15 / 80

SAIC Exploranium – GR-135 System Manual page: 15
e) POWER OFF - MANUAL
To power the unit OFF, CLICK UP (away from the user) and hold for
approx. 5 seconds. The display (Fig. 2) shows the seconds counting
down; 3, 2, 1. After this countdown the unit powers OFF. At any time
during the countdown, releasing the JOYSTICK will cancel the power
OFF.
Fig. 2
f)
LOW BATTERY WARNINGS
The Battery ICON at the top right of the display is used to provide the user with an idea of the
current battery status. Unfortunately rechargeable NiCd batteries exhibit a very flat discharge curve.
This means that for a very long period the battery voltage is almost constant and then it will
suddenly discharge very rapidly at the end of battery charge. This battery characteristic means that
it is not possible to display a fully accurate battery-life indication.
Exploranium recommends that it is a sensible precaution to carry a spare set of ALKALINE batteries
in the system pouch if extensive field operations are required, to act as a backup (but NOT for DS
operation!). This ensures that battery failure does not prevent data acquisition when required.
For convenience, most users tend to use the NiCd rechargeable batteries. To provide some level of
warning of imminent battery life - if the batteries fall below a certain level then a 3-beep audio
occurs and the Battery ICON changes to the message LOW. The user has between 2 and 10
minutes of measuring time left in the battery at this time. When there is no longer enough power to
allow measuring, the GR-135 turns off.
Full Charge ½ Charge Low Battery Warning
Fig. 3
5.3 SWITCHING FROM AUTOMATIC MODE TO MANUAL MODE
With the unit set up correctly and being operated by the user, it is important to ensure that no one
changes the system settings in an unauthorized manner. For this reason there is a “hidden” slider
switch in the battery compartment used to select modes. (On more recent models the slider switch
is located behind the battery door on the right hand side – see Figure on page 8).
The slider switch has 2 modes labeled “
A
” for AUTOMATIC mode and “
M
” for MANUAL mode. With
the unit switched OFF, the user should select the mode of operation then power the unit ON to
activate the mode.
LOW
TURNING OFF
3 (2,1..)
NOTE
LIKE ALL COMPUTER BASED SYSTEMS THERE IS A SLIGHT POSSIBILITY
THAT AN UNEXPECTED COMBINATION OF USER ACTIONS COULD CAUSE THE
SYSTEM TO HANG UP.
WHILE HIGHLY UNLIKELY, USERS ARE ADVISED THAT IF UNUSUAL
ACTIONS OCCUR - SWITCH THE UNIT OFF AS DESCRIBED IN (e) ABOVE AND
AT THE NEXT POWER ON THE SYSTEM SHOULD BE OK.