EN-12
7. PREPARATION FOR USE
Power Supply
The instrument can be powered by internal batteries, or for extended operation by an
optional external 9V DC supply such as a suitable AC mains adapter or battery pack.
Rechargeable batteries may be used in the instrument, but cannot be recharged when
fitted as the instrument is not designed to recharge batteries.
Before inserting or replacing the batteries and before connecting the AC adaptor, be
sure to turn the instrument off.
1. Battery Installation
When the low battery indication symbol “ ” appears on the display, there is
insufficient power to make accurate measurements and the batteries must be
replaced.
Before replacing the batteries, press the
button to turn off the instrument.
Remove the cover of the battery compartment.
Insert the new 9V battery.
Replace the battery cover.
Press the
button to turn on the instrument and check for correct operation.
2. Using an external power source
Insert the plug of the AC adaptor or external battery pack into the DC 9V (DC source
from 6V to 12V) socket on the side of the instrument. When a connector is inserted
into this socket, the internal batteries will be disconnected and the instrument will be
powered from the external source. The low battery symbol “
” will appear on
the display if the external voltage is insufficient for the instrument to provide
accurate measurements.
Note: Ensure the external power source is connected with the polarity as indicated
in the following diagram, otherwise damage may be caused to the instrument and
external power source.
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