Cirrus Optimus Green Series, Instrument Hanbook

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Optimus sound level meter - instrument handbook
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9 Acoustic calibrator information
This chapter refers to the use of a Cirrus Research plc CR:514 or CR:515 acoustic
calibrator.
9.1 Setting up the calibrator
Press the power button on the end of the calibrator to switch the unit on. The indicator
will illuminate to show that the unit is operating. The calibrator will automatically switch
off after five minutes to preserve battery power.
To switch the calibrator off manually,
press the power button again and the
indicator will extinguish to show that
the unit is switched off.
Permanent-on mode
For some applications there may be a
need to have the calibrator switched on
continuously. To allow for this, the
calibrator can be turned on by pressing and holding the power button for three seconds.
Release the button and the indicator will flash to show that the unit is in permanent-on
mode. Press the power button again to switch off the calibrator.
9.2 Calibrating a sound level meter
Push the microphone of the sound level meter 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.
Power Indicator
Power Button