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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