BB106411.book : 2237-ch2 Black 5
Chapter 2 – Getting Started
Fitting Batteries
BB1064–11
2–5
2237 Controller
User Manual
3. Remove all of the old batteries.
4. Insert new batteries (four 1.5 V LR6/AA size alkaline
batteries) following the +/- orientation shown in the bot-
tom of the battery compartment.
5. Press the compartment lid back into place.
Note: If you cannot switch on the sound level meter 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 bat-
tery 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 10 hours. Fully charged, the back-up bat-
tery runs the clock and retains records and settings for about
6 months.
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.
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