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The 2032 can be calibrated for sound pressure measurements using, for instance, a
Pistonphone Type 4220, (see Section
6.2.7,
step 1 ). Should a Pistonphone not be avail-
able, the following procedure may be used.
1.
Set the Calibration field of the MEASUREMENT SETUP of the appropriate input to
V /PA, and enter the microphone sensitivity into the Calibration field.
2.
Select display of the Autospectrum for the appropriate channel and check that the
Units Type field of the Y -scaling control fields of the DISPLAY SETUP is set to
RMS.
3.
Set the Units field of the Y -scaling control fields for read-out in relative units.
4.
Move the Field Selector one field to the right to the Reference Level field, and
enter a reference level of 20
J.l.
The appropriate channel of the 2032 will then be
calibrated to read in dB referred to 20 J.lPa.
6.2.7. Calibration of the 2032 for Sound Intensity Measurements
Step 1
Fig.6.9.
The 2032 Display calibrated for sound intensity measure-
ments
Calibration of the 2032 for sound intensity measurements with .the Sound Intensity
Probe Type 3519 requires use of a Pistonphone Type 4220. This is because there is a
slight attenuation of signal levels within the probe, meaning that the procedure of
Section 6.2.6 will produce a calibration error. The Pistonphone produces a sound pres-
sure level of 124 dB re. 20 J.LPa at 250Hz. (This is at normal atmospheric pressure.
Should the atmospheric pressure deviate from normal, it may be necessary to apply a
correction which can be obtained from the Barometer supplied with the Pistonphone).
The calibration procedure is as follows:
1.
Follow the procedure of Section 6.2.6 to obtain an approximate calibraUon. The
microphone sensitivity entered in the Calibration Constant field of the MEASURE-
MENT SETUP need not be exact.
103
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