88
GSM19 Series Magnetometers - Version 7
GEM Systems, Inc. Advanced Magnetometers
For more technical information, visit www.gemsys.ca
11. STORING YOUR MAGNETOMETER (IMPORTANT!)
The unit goes to
shelf-off mode automatically after 24 hours
of being turned off (
0F
command).
To minimize power consumption from the battery when the unit is not in service, the shelf-off
function switches OFF the main power and also powers down the internal oscillator that normally
maintains time. Date and Time
have to be programmed again
the next time you use the unit.
NOTE that date and time can only be maintained within 24 hours after the unit is switched off.
If the unit is stored for very long time in addition to the automatic shelf-off function, the internal
battery should be periodically recharged (see below).
12. CHARGING THE BATTERY (IMPORTANT!)
The internal battery is 12V lead acid 2.0 Ah battery. To maximize its lifespan, you MUST maintain
it in the following manner:
•
Do not allow the battery to fully discharge
since this may cause internal leakage or shorts.
•
Even if an external battery is used, charge the internal battery frequently.
•
Always keep it charged (charger is automatic so overcharging is not possible). Additionally, the
shelf-off function is triggered automatically after 24 hours of having the unit switched off by
pressing
OF
.
•
If the unit is used daily, always charge it overnight.
If the unit is left “on” for a long period of time and the battery voltage drops to 8.5V, it
automatically switches off. 24 hours later the automatic shelf-off is triggered.
NOTE:
Batteries are NOT included in the normal warranty provided by GEM as their
lifespan is determined by the way in which they are normally maintained.