Cirrus Optimus Green Series, Instrument Hanbook

Page: 13 / 56

Optimus sound level meter - instrument handbook
12
13
2.3 Calibration
All noise measuring instruments should be calibrated before each use because the
mircrophone is susceptible to minor damage, even from small knocks.
The calibration process applies corrections (if needed) to your instrument’s readings, to
ensure that your measurements are as accurate as possible.
Calibration should also be carried out at the end of a measurement session to make
sure that nothing has happened to the instrument during the session.
To calibrate your Optimus, carefully push the microphone into the cavity at the end
of the calibrator. Ensure the microphone is fully inserted into the cavity and is past the
‘O’ ring seals.
Ensure that the small bleed hole next to the microphone cavity on the calibrator is not
blocked, as this could cause damage to the microphone.