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Step 2
2.
Apply the Pistonphone signal to one of the microphones, and display the Auto-
spectrum of that channel with Exponential Averaging of, for example, 10 spectra.
Flat Top weighting should be selected.
3.
Move the cursor to the line corresponding to the Pistonphone signal on the 2032
·
Display, (---250Hz).
4.
Index the Field Selector to the Calibration Constant field of the MEASUREMENT
SETUP for the appropriate channel, and adjust its setting until the Y cursor field
reads 124 dB, or the corrected value should a correction have been necessary.
5.
Repeat the procedure for the second of the two microphones.
1.
Set the Function control field of the DISPLAY SETUP to Sound Intensity.
2.
Set the Units field of the Y -scaling control fields of the DISPLAY SETUP for read-
out in relative units.
3.
Move the Field Selector one field to the right to the Reference Level field, and
enter a reference level of 1 x 1
o-
12
.
4.
Move the Field Selector to the Universal Parameter field, (see Section 5.6), and
select Sound Intensity Calibration. Enter the size of microphone spacer in use, the
temperature, and atmospheric pressure.
5.
The 2032 is now calibrated for sound intensity measurements. When the Y -scaling
control fields are set for read-out in absolute units, the sound intensity will be read
in W /m
2
•
When they are set for read-out in relative units, the sound intensity will
be read in dB re. 1 pW /m
2
•
6.3. INFLUENCE OF INTEGRATION AND DIFFERENTIATION ON THE CALIBRATION OF THE 2032
104
Calibration of the 2032 is maintained when the integration and differentiation functions
built into the 2032 are used, that is, cursor readings will be correct and will take
account of any integration/differentiation. The units of the read-out, however, remain
unmodified. This should be remembered when assigning units to the cursor read-outs.
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