CESVA CB004, User Manual

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3.3. Battery replacement
The CB006 and CB004 acoustic calibrators use a single 9 V alkaline battery.
1) Unscrew the screw (7) holding the battery cover on, using a coin.
2) The battery can now be eased out of its holder and replaced. The battery should be
eased out terminal side first by pushing against the spring at the other end. Ensure that
the battery is inserted with the correct polarity with the negative terminal at the contact
with the larger cut-out.
Turn on the calibrator and check that the battery state indicator (4) lights.
3.4. Battery type
The battery should be an alkaline battery type 6LR61, called NEDA 1604 in the USA and
parts of Asia. It is often called PP3 in the UK. The battery is 9 V when new and will operate
the calibrator down to 6.4 V. When the battery voltage is below 6.6 V but above 6.4 V, the
battery state indicator (4) will flash to indicate that the battery voltage is low. When the
battery voltage is below 6.4 V the calibrator will not turn on. A discharged battery may allow
switch-on but will soon drop in voltage and indicate low battery or switch off.