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7. PREPARATION FOR USE
Power Supply
The instrument can be powered by internal batteries, or for extended operation by an
optional external 6V 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.
Use a screwdriver to loosen the screw in the battery cover. Remove the cover
from the battery compartment. Retain the screw and cover.
Observing correct polarity as indicated in the compartment, insert four batteries
of the type given in section 4. “Specifications”.
Refit the battery cover and screw. Use a screwdriver to tighten the screw.
Press the
button to turn on the instrument and check for correct operation.
Note: Take care not to reverse the (+) and (-) polarity when inserting the batteries,
otherwise the instrument may be damaged.
Always replace all four batteries at the same time.
Do not mix old and new batteries or batteries of different types.
Remove the batteries from the instrument if it is not to be used for a month or
longer.
2. Using an external power source.
Insert the plug of the AC adaptor or external battery pack into the DC 6V (DC source
from 5V to 6V) 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.
