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

Calibration Procedure with Hand-held Analyzer Type 2270-S Sound Intensity System
✐
If a sound intensity probe is not placed in the chamber, the unit will shut down after
Please note:
approximately 10 seconds.
7) Allow at least 5 seconds for the pressure to equalize and for stabilization of the feedback
circuit.
8) Tap Calibrate and wait for it to finish.
2.2

Phase Calibration and Pressure-Residual Intensity Index Verification

Phase calibration and pressure-residual intensity index verification are part of the complete
calibration process and should follow after sound pressure level calibration; however, they can
also be performed individually. If calibrating and verifying phase by itself, perform steps 1)
through 5) and then continue from step 9).
✐
Minimize vibrations at your work surface/equipment during calibration as vibrations will
Please note:
falsely affect readings.
9) On the Type 4297 control panel (see Fig.2.6), press the sine wave/broadband noise button
again (so the broadband noise LED indicator lights) then press the Start button.
10) On Type 2270-S, tap on the
screen will appear (Fig.2.7).
Fig.2.7
Phase Calibration
screen
11) Tap Calibrate and wait for it to finish.
✐
Tapping Calibrate includes the verification process, but verification can be performed
Please note:
individually. To do so, tap Verify and let the verification continue for 2 minutes and press
Stop Verify
12) Tap Yes to accept the new calibration (and verification). There should be no yellow smileys.
tab at the bottom of the screen and the Phase Calibration
Phase
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