Calibration; Cal Value (Db) - Castle group dBAir Operating Manual

Calibration

Select Calibration to acoustically calibrate your dBAir sound level meter.
It is recommended that the calibration procedure is undertaken prior to, and after
measurements have been taken using the Castle GA607 acoustic calibrator.
Automatic calibration reminder can be activated, see Startup Options.

Cal Value (dB)

Adjust the Cal Value (dB) using the Left or Right Arrow keys between 90.0 and 114.5
dB in 0.1 dB steps. Include both atmospheric pressure and microphone dependant
pressure to free field corrections in the Cal Value.
Ensure the calibrator is attached to the microphone by gently inserting the microphone
into the cavity of the calibrator. A certain amount of resistance should be felt whilst
inserting the microphone as the O-ring on the calibrator forms a seal around the
microphone. Ensure that the calibrator is switched on and set to the output level 94dB.
When the Cal Value is set correctly, including corrections, press OK to begin calibrating
your dBAir sound meter.
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