Chapter 2 – Getting Started
Fitting Batteries
10
Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
4. Insert new batteries (four 1.5 V LR6/AA size alkaline bat-
teries) following the +/- orientation shown in the bottom
of the battery compartment.
5. Press the compartment lid back into place.
Note: If you cannot switch the sound level meter on after
replacing the batteries, check that you have inserted them
correctly. The sound level meter is designed so that it will not
work if the batteries are inserted incorrectly in the battery
compartment.
2.1.3 The Back-up Battery
The sound level meter has a back-up battery for running the
clock and maintaining the records and settings, even when it
is switched off or the main batteries are removed.
The back-up battery is recharged automatically when there
are standard batteries in the sound level meter. It is fully
charged after about 24 hours. Fully charged, the back-up bat-
tery runs the clock and retains records and settings for about
6months.
These charge times are typical for a sound level meter at room
temperature.
Important:
If the back-up battery is flat, then you will see the Set-up
Language Window when the instrument starts-up (see section
2.4). The measurement settings, date and time will also be
reset to factory-set values.
If this happens, then your instrument’s calibration may no
longer be valid. Contact your Brüel & Kjær dealer to have your
sound level meter recalibrated.
bb221911.book Page 10 Tuesday, July 24, 2001 11:23 AM
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