Soft dB Opus Suite Intensity Module - Manual (Page 12)

10
5.1 Calibration Process
The calibration process includes the amplitude calibration of microphones, a phase check and a PI
Index check. The amplitude calibration is performed using a sound pressure calibrator and the phase
and PI Index check is performed using the G.R.A.S. 51AB sound intensity calibrator wired to the
output 1 of the Concerto.
Amplitude calibration is usually performed first, then Phase check is performed and only then the PI
Index check will become available.
5.1.1 Pressure Calibration
To perform pressure calibration of a microphone:
1. Insert Microphone A in the pressure calibrator.
2. Click on the Mic A Calib button on the Calibration Process interface to launch the Pressure
Calibration interface.
3. Turn On the calibrator and select the appropriate frequency and amplitude on the interface.
4. Click START to begin calibration. An averaging is performed on the signal and the resulting
spectrum is displayed on the interface.
5. When averaging is done, the sensitivity is updated.
6. Click OK to accept.
7. Repeat steps 1 to 6 to calibrate microphone B.