Final check
17
3.8 Battery voltage
3.8.1 3.0 V battery (board)
As the 3.0 V lithium cell is hard to reach, its charge status can be called up both via the interface and via
a corresponding menu.
1. Switch on device and simultaneously keep the alarm mute key depressed.
The device is in battery control mode for 3 seconds and then switches to normal operating mode.
Within these 3 seconds, the “Energy supply” alarm in the alarm field comes on and the measured
voltage value of the lithium cell is displayed in the pressure bar graph.
In the table you will find an assignment of bar graph values to battery voltage values.
Requirement:
Measured value for 3.0 V battery is in the range 3.0 to 3.2 V, the alarm for this cell is
triggered at 2.7 V.
2. Switch off device.
3.8.2 3.6 V battery (battery compartment)
1. Open battery compartment with a screwdriver.
2. Remove 3.6 V battery from battery compartment.
3. Measure voltage using a digital multimeter.
Requirement:
Measured value for 3.6 V battery is in the range 3.4 to 3.7 V.
4. Put battery
back in device correctly.
5. Close battery compartment.
Bar graph value (mbar)
Battery voltage (V)
60
3.21
55
3.19
50
3.17
45
3.15
40
3.13
35
3.11
30
3.09
25
3.07
20
3.05
15
3.03
10
3.01
5
2.99
0
2.97