Phase Calibration And Pressure-Residual Intensity Index Verification - BRUEL & KJAER 4297 User Manual

18 Sound Intensity Calibrator Type 4297 – User Manual
7) Turn off the calibrator, remove the probe, insert the protection plug and close the calibrator.
Fig.3.5
Type 4297 control
panel showing the
start, sine wave/
broadband noise
selector buttons and
LED indicators
3.2

Phase Calibration and Pressure-Residual Intensity Index Verification

3.2.1 Verification up to 3 kHz
The following steps describe the procedure used for phase calibration and verification of
pressure-residual intensity index with Type 2260-E using a broadband pink noise source at
frequencies up to 3 kHz. Please also refer to section 2.3.1 in the technical documentation for
Sound Intensity Software BZ-7205 (BB-1131).
1) With the sound intensity probe correctly placed in Sound Intensity Calibrator Type 4297,
press Start on the Type 4297 control panel (if necessary). The sine wave LED indicator will
light.
2) Press the noise type toggle on the control panel to select the pink noise source. The sine wave
LED indicator should now go out while the LED indictor for broadband pink noise should now
light. If it does not, then the batteries should be replaced as described in Chapter 1.
3) Allow at least 5 seconds for the pressure to equalize.
4) Press the Calibrate button on Type 2260 (not the soft key on the display).
5) Select the Calib. Menu soft key and then choose p-Residual Intens. Idx.
The screen should now look like Fig.3.6.