UNAOHM
18
EP2500 (Rev. 0)
6.3
POWER SUPPLY MODES
The instrument may be powered by an internal battery, or by an external source connected to the
EXT
(40)
jack.
Whenever possible, use an external source to power the instrument; only when an external source is not
available use the internal battery of the instrument. The same external source of power is used for
recharging the battery when the instrument is turned off. The source of power is automatically selected.
NOTE:
The minimum external operating voltage is 12V while a voltage of at least 15Vdc is required to
recharge the battery.
CAUTION:
The negative (“-“ or “minus”) pole of the external source of power must NEVER come
into contact with the ground.
NOTES:
•
The length of recharge time required will never be the cause of damages to the battery in any case
.
•
The battery capacity is reduced at low operating temperatures
.
•
When the instrument is not used for long periods of time, we recommend to recharge battery at least
once a month, to avoid self discharge
.
6.3.1
Low Battery Indication
When the remaining duration of the battery reaches ten minutes, the indication “Low Battery” is
displayed every 30 seconds.
6.4
11VDC. AUXILIARY OUTPUT SOURCE OF POWER
An 11 Vdc source of output power
(41)
is available to the operator and offers self protection and a 150
mA current limiter (see
Figure2
).
