Larson Davis SoundAdvisor 831C Reference Manual page 74

FIGURE 7-2 WS001 Windscreen
7.1.2 Performing an Area Sound Field Check
SoundAdvisor Model 831C
Microphone Extension Cable
Always position the preamplifier/microphone in a way to minimize the effect
TAKE NOTE
of reflections on the sound field near the microphone.
A shielded microphone extension cable may be placed between the meter and the
preamplifier/microphone if needed for the measurement position. No correction is
necessary when using Larson Davis Model EXCXXX microphone extension cables in
combined lengths up to 200 feet. XXX is the length in feet (XXX = 010, 020, 025, 035, 050, 060,
100 and 200) available.
Windscreen
Wind blowing across the microphone generates pressure fluctuations on the microphone
diaphragm which can produce errors in the measurement. As a result, when performing
measurements in the presence of low level airflows, we recommended that you place a
windscreen over the microphone and preamplifier. Larson Davis provides the WS001
windscreen, which is a 3 ½-inch diameter ball made of open cell foam.
Starting a measurement during a dramatic sound change can affect your data in an
unwanted way. Before starting any measurement, it's a good practice to briefly monitor the
area sound.
Step 1.
On the meter, observe the current sound readings on the Live tab as shown in
Figure 7-3.
Because
protect the microphone from
accidental
recommend using it even when
measuring indoors.
Before You Start
the windscreen can
damage, we
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