Cirrus Optimus+, Instrument Handbook

Page: 8 / 53

Page 8
Sound Level Meters – User Manual
2.1 Inserting the batteries
Your sound level meter is powered by 4 x AA alkaline batteries (also called MN1500 or LR6).
We recommend that you use alkaline batteries to give the best performance.
Remove the battery cover by loosening the captive locking screw (as shown in the diagram
below).
Please look carefully at the diagram inside the battery compartment that shows the correct
polarity. After inserting the batteries in the correct orientation, replace the cover and tighten the
locking screw.
The instrument is switched on by pressing and releasing the on/off button on the left-hand side
of the case. After the bootup screen has been displayed, your sound level meter will show the
last view you used.
2.2 Setting the clock
Your instrument stores the date and time with all measurements to help when analysing results
and ensuring the accuracy of the data. It is important to check that the instrument’s clock is
correctly set before starting a measurement session. It is visible on the top-right corner of the
screen.
To set the clock, press the ‘menu’ button after the instrument has been turned on. Select the
‘Set Clock’ menu and follow the instructions on-screen.