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With the sound intensity probe correctly positioned, close the unit completely by reversing the
procedure described above, as shown in Fig.3.4. The unit should close without any excessive
pressure being required. This indicates that the sound intensity probe is correctly fitted in the
compartment.
Fig.3.4
Type 4297 with a sound
intensity probe in
position
3.1.2
Calibration
You are now ready to start the sound pressure calibration using your Type 2260-E installed with
Sound Intensity Software BZ-7205.
✐
Do not disturb your work surface/equipment during calibration as this will falsely affect
Please note:
readings.
1) With the sound intensity probe connected to your Type 2260-E Investigator
Type 2260. Press the Start button on the Type 4297 control panel (see Fig.3.5). The sine wave
(251.2 Hz) LED indicator should light. If it does not, the batteries need to be replaced, as
described in Chapter 1.
✐
If a sound intensity probe is not placed in the chamber, the unit will shut down after
Please note:
approximately 10 seconds.
2) Allow at least 5 seconds for the pressure to equalize and for stabilization of the feedback
circuit.
3) Press the Calibrate button on Type 2260-E.
4) Select Calib. Menu followed by External. Using the arrow keys, select the calibrator
or
Type 3541
soft keys. Set
5) At this point, you can also change
6) Select Calibrate on the screen menu. The display will advise that the calibration process is in
progress. When calibration has been completed following a steady-state signal, select Save.
If you wish to repeat the external calibration, choose Undo to repeat the process. Typical
results for channels 1 and 2 are –38 dB (the open circuit sensitivity as read from the
calibration chart).
, then set the
Unknown
Calib. Level
to 0.000.
Correction
Temperature
Calibration Procedure with Type 2260-E Investigator™
manually to 94.00 dB using the arrow keys and
and
Amb. Pressure
CHAPTER 3
™
, switch on
to your chosen values.
17
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