SV 104 USER'S MANUAL_
DRAFT
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4
RUNNING AND OPERATING BASIC PROCEDURES
4.1
Charging
SV104
dosimeter is equipped with an internal charger, so that the fixed internal batteries can be
charged directly from USB port or optionally provided charger (
SA 54
).
Ensure the
SV 104
is fully charged prior to use by connecting it to a USB port or to USB charger.
Ensure the power supply is connected and the supply is switched on. The
SV 104
will automatically switch
on during charging and display how much charge is within the instrument. The
SV 104
will display ‘Fully
charged
’ once charging is complete. This should take approximately 2 hours from a fully discharged state. A
charging time of about 30 minutes will be sufficient to perform greater than 8 hours of measurement. A fully
charged instrument holds enough charge to run for approximately 40 hours.
Note that once disconnected from USB power supply, the dosimeter will automatically switch off.
If returned to the USB connection or put again onto the docking station the dosimeter keeps trickle charging
regardless of whether or not it is fully charged. This keeps the battery performance in steady condition. If the
battery is fully discharged prior to being placed on a charger, the
SV 104
trickle charges for a short time prior
to the fast charge cycle, this prevents damage to the batteries.
The number of hours you have used your dosimeter from your last charge will impact your total charge
time. For example, if the battery clock indicator displays 40 hours remaining on the battery and you wish to
charge the battery, the approximate charging time is 1 hour.
Notice:
To charge a fully discharged battery, it would take approximately 1.5 to 2.5 hours.
Note also, that instrument under charging condition is slightly warm. It is normal state for NiMH type cells
and does not affect the measurement accuracy.
Notice:
To charge multiple dosimeters
at the same time via the USB port, ensure your
computer or possibly the powered USB hub such as the
SA 156
or switch is capable in terms of providing
enough current performance. Standard hub or switches without external power supply are not capable to
charge multiple SV104 dosimeters due to insufficient current supply.
Current estimation: Assume the current consumption on 0.5A level, and calculate required power supply
requirement (N x 0.5A).
Power wattage estimation: With nominal voltage of 5V per USB, the power supply wattage should be 2.5W
per dosimeter (Nx2.5W).
For example 5 dosimeters charged at once require: 2.5A/12.5W USB power supply
For example 3 dosimeters charged at once require: 1.5A/7.5W USB power supply
For example 1 dosimeter charged alone requires: 0.5A/2.5W USB power supply
Notice:
Use only high quality USB cables, such as
SC 156
. Many poor quality cables do not
ensure low resistance of the cable, thus disabling proper charging of the internal cells.
