laerdal Bemis 78 00 20, Directions For Use Manual, Page: 9 / 28

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This green LED bargraph has 3 functions:
During operation from internal battery - indicates approx. remaining battery capacity.
Note:
Immediately after turning the LSU ON and immediately after switching from external
power to internal battery operation, all 4 LED’s will flash for 5 seconds before the remaining
battery capacity is displayed. Due to the nature of voltage based battery capacity measurement,
the battery status indication may differ from unit to unit. Each battery may vary in voltage versus
remaining capacity, thus allowing for variability in the reading. Other outside variables such as
temperature may also affect accuracy. The indication is targeted to show battery capacity as
indicated below. The graph shows how the accuracy of the indication can vary.
TYPICAL REMAINING BATTERY CAPACITY
(for a new battery stored in room temperature )
OUTPUT
> 50 %
4 LEDs lit.
30 - 50%
3 LEDs lit.
20 - 30%
2 LEDs lit.
< 20%
1 LED lit.
Battery Low; (min. 1 minute of operation left based on
500+ mmHg/free flow).
1 LED flashes.
Note: If the LSU or the NiMH battery has been stored at low temperatures
(< 12 °C / < 54 °F), the LSU may indicate lower remaining battery capacity than actual when
first switched on. This is due to the nature of NiMH batteries. The battery indicator may flash on
one LED, which normally indicates Battery Low. The LED may continue to flash until the LSU
temperature is above 12 °C / 54 °F and the LSU is switched off and on again. The low
battery indication in this instance is not a correct indication of the residual battery capacity.
During charging - indicates approx. achieved battery capacity.
CAPACITY OUTPUT*
< 75% The LED’s will be lit sequentially.
75-80% 3 LED’s lit and 4th flashing.
> 80% 4 LED’s lit.
*Note: If no battery is installed, the battery status indicator will be fully lit for approx. 5 sec.
until it is turned off.
During the Device Test - indicates which step of the test is currently in
progress or which corresponding test result is being displayed:
LSU DfU US 6791 rev H.indd 9 30.09.2016 14:39:50