3M AcoustiCal AC-300 User Manual - Performing A Calibration
3
Performing a calibration
AcoustiCal User Manual
Performing a calibration
A microphone is sensitive to temperature and pressure changes. Calibrating
before taking measurements assures that your level measurements are
accurate for the current environment; and performing a calibration after use
allows you to verify the integrity of both the calibrator and the sound level
meter.
Note:
Please refer to the instrument’s user manual for details on calibrating.
1.
Ensure the ambient noise level is less than 88 dBA.
2.
Slowly insert the appropriate adapter (if needed) and microphone into the
calibrator cavity ensuring the microphone is fully seated (or inserted).
3.
Power on the calibrator and allow at least 10 seconds to stabilize.
4.
Set the appropriate frequency on the AcoustiCal by selecting 250 Hz or
1000 Hz via the key.
5.
Perform the calibration with the sound level meter or dosimeter.
6.
Power off when complete by pressing and holding the key.
Note:
The microphone orientation is displayed below for a noise
dosimeter and a sound level meter.
Figure 4: Examples of performing a calibration