
25
Reference
Example: Output sound pressure level
L
for 1/2-inch microphone with known
effective load volume
Specifi ed sound pressure level
L
s
at reference conditions:
114.05 dB (example, as per calibration
chart)
Static pressure at time of use
P
a
:
98.8 kPa (example, measured with ba-
rometer at time of use)
Microphone effective load volume
V
L
: 224
mm
3
(example, according to catalog
data for microphone)
L
= 114.05 + (-0.00041 × (224 + 909 - 960)) + 20 × log
10
98.8
101.325
=
113.76 dB