4.2 EXTERNAL DC
The unitwill run from an external 12 – 20 VDC power sourceviathe DC jack.Thismaybe either
the AC adaptor or any other DC supply that meets the specification. Centre is positive.
Note that the batteries are charged when external 15 – 20V DC power is applied and the
unit is switched off – DO NOT FIT NON-RECHARGEABLE BATTERIES.
4.3 MEMORY BACK UP BATTERY
The memory back up battery is a lithium manganese cell which is part of the main PCB
assembly.
The life expectancy is typically four years and replacement is recommended every two years
during a routine service to avoid possible loss of stored traces.
Radiodetection Ltd. 00901209-6
T631 OPERATING MANUAL 18
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