GE 37 400, Technical Reference And Operating Manual

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3 Initial start-up Power supply
3-8 Issue 2 (12/2013) USM 36
Charging the batteries
You can charge the lithium-ion batteries either directly
within the instrument or in an external charger.
Internal charging
If a lithium-ion battery is inserted, charging starts auto-
matically as soon as you connect the charger/power
adaptor to the USM 36 and to the mains power supply.
You can carry out ultrasonic tests and charge the batter-
ies at the same time.
The charging time is approx. ten hours with simultane-
ous ultrasonic testing. If the instrument is not used for ul-
trasonic testing, the charging time is approx. eight
hours. This charging time applies to ambient tempera-
tures of 25 … 30 °C.
Charging status
The LED on the charger/power adaptor indicates the
status of charging.
off: Charger/power adaptor is not con-
nected to the power supply
yellow steady light: Charger/power adaptor is not con-
nected to the instrument or no bat-
teries are inserted into the instru-
ment
flashing green light: Charging
green steady light: Charging is completed, batteries
are charged
External charging
You can charge lithium-ion batteries with an external
charger of the USM 36. Do not use any other chargers
for charging the lithium-ion batteries for the USM 36.