User's Manual

Recalibration
Recalibration consists of a charge, followed by a calibration discharge. Finally the battery is given a regular charge. A calibration cycle is faster if the
battery is fully charged to begin with.
If fuel gauge recalibration is needed, the red LED on the charger will flash upon insertion of the battery. The user can either calibrate the fuel gauge
and charge the battery, or just charge the battery.
For starting the recalibration, press the calibration button corresponding to the battery to be recalibrated. If the button is not pressed, the charger
will automatically begin to charge the battery. At the end of the calibration the blue LED will stay constant indicating a fully calibrated fuel gauge.
The blue LED will flash to indicate that the battery is undergoing the recalibration cycle. Note that calibration is initiated each time the button is
pressed or each time the battery is removed, so it is not recommended to press the recalibration button part way through the recalibration cycle.
What is recalibration and why is it needed?
As the battery ages and is used, its available capacity shrinks. So, with each cycle, K5 runtime gets a little bit less. A good rule of thumb is that Li-Ion
batteries lose 5% capacity per 100 cycles and 5% per year.
The fuel gauge not only provides the battery’s remaining capacity, it also gives an estimated accuracy figure known as the “Max-Error”. This keeps
track of the overall accuracy of the estimated remaining capacity. Recalibration is used to re-set the fuel gauge to match the actual capacity of the
battery. In this way, even as the battery ages and things change, the accuracy and reliability of the fuel gauge can be retained throughout the life of
the battery.
 Portable unit
Powering
The portable unit can be supplied either by the Power supply adapter or by rechargeable batteries. During warm-up, it is recommended to supply it
exclusively by the Power supply adapter in order to save the battery normally used during the test.
The external Power supply adapter can be connected between the AC mains plug and the
connector on the top side of the K5 unit and both
powers the unit and charge the battery inside it.
Top side
1. O
2
sensor / CO
2
absorber slot 2. Flowmeter connector
3. Antenna 4. Earphone connector
5. Sampling line connector 6. Air inlet
7. HR Polar receiver / TTL ecg connector (if available) 8. USB connector
9. Power supply connector 10. Battery / SD card slot
Warning: In order to obtain the required performances in terms of degree of protection against the ingress of liquids
or other particles (IP grade) be sure that all the covers are properly placed and closed.
1
2
4
6
7
8
9
10
30 - Installation - Preliminary operations