18
•
Observe battery polarity and the back panel battery orientation pattern (the
negative battery terminal is the one closer to the side of the instrument).
•
Insert the battery by sliding it in until it bottoms out. It should protrude slightly
above the bottom surface of the instrument.
•
Place battery compartment cover over battery and, while pushing down the cover
firmly (taking care that the cover seats flush on the bottom surface of the
personal
DataRAM), tighten thumbscrew securely.
6.2 Battery
Replacement
Normally, only a 9V Duracell® type MN1604 alkaline batteries should be used with
the
personal
DataRAM in accordance the MSHA intrinsic safety approval.
Only fresh batteries should be used in order to ensure the maximum operating time.
The
personal
DataRAM shuts itself off whenever the battery voltage falls below 6
volts (while retaining all programming and data). A fresh 9V alkaline battery, at
room temperature, should provide typically 20 hours of continuous operation (please
note that not all manufacturers produce batteries of equal capacity). Intermittent
operation should extend the total running time because of partial battery recovery
effects.
The approximate remaining battery capacity is indicated by the
personal
DataRAM
(see Section 8.2) in increments of 1%, starting from 99%. If the remaining battery
capacity is 40% or less, immediate restarting after shut off is automatically inhibited
to prevent incomplete runs. If, nevertheless, a new run is to be initiated with low
remaining battery capacity, do not shut off the
personal
DataRAM at the end of the
previous run (i.e., remain in the Ready Mode, see section 7.0).
When significantly extended operating times are required (beyond the typical 20
hours), the use of either lithium or zinc-air batteries can be considered. The use of
such alternative battery types can provide about 2 to 3 times longer operation than
alkaline batteries.
6.3
AC Power Supply
A universal line voltage AC to DC power supply (model
p
DR-AC) is provided as
standard accessory with the
personal
DataRAM. This power supply can be used with
any line with a voltage between 100 and 240 VAC (50 to 60 Hz). When using that
power supply, its output plug should be inserted into the external DC receptacle at
the base of the
personal
DataRAM (see Figure 3 or 4). Insertion of that connector
automatically disables the internal 9V battery of the instrument. Removal of the
p
DR-AC plug from the instrument automatically re-connects the internal 9V battery.
NOTE: Before plugging in or unplugging the external power supply, the
personalDataRAM must be shut off.
