HBK 4231, User Manual

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Chapter 1 – Introduction and Controls
3 Sound Calibrator Type 4231
User Manual
1.4 Batteries
The calibrator uses two 1.5 V IEC Type LR6 (American “AA”) size
batteries, HBK order number QB 0013. If you want to use other types of
batteries, we recommend that you choose only good quality alkaline
batteries.
When the batteries need changing, the calibrator stops working
continuously, and only works if you hold down the button. This
feature is an indication to you that the batteries are running low on
power. When this occurs, you must change the batteries before
performing a calibration, as the instrument will not give an accurate
SPL with weak batteries.
To keep the batteries and the calibrator in good condition:
•
Take the batteries out if you are not going to use the calibrator for
a long period of time
• Always take old batteries out as soon as they become exhausted
• Replace both batteries at the same time, using two batteries of the
same type
1.4.1 To Replace the Batteries
1) Take the calibrator out of its case.
2) Remove the 1/2

adapter. (see Fig.1.2).
3) Remove the two battery lids on each side of the 1/2

adapter by
sliding them outwards.
4) Replace the batteries, making sure that the polarity of the batteries
is the same as the markings in each battery compartment.
5) Replace both battery compartment lids and the 1/2

adapter on
the calibrator and put it back in its case.