Area Sound Field Check - Larson Davis SoundAdvisor 831C Reference Manual

Microphone Extension Cable
Always position the
TAKE NOTE
preamplifier/microphone in a
way to minimize the effect of
reflections on the sound field
near the microphone.
Windscreen
FIGURE 7-2 Windscreen

7.2.2 Area Sound Field Check

SoundAdvisor Model 831C
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.
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, it is recommended that a windscreen be
placed over the microphone. Larson Davis provides the WS001
windscreen, a 3 1/2" diameter ball made of open cell foam which can
be placed over the microphone and preamplifier.
Starting a measurement during a dramatic sound change can affect
your data in an unwanted way. Before starting any measurement,
check the area sound field by navigating to Live on the meter and
ensuring your measurement is ready to begin.
While every task is unique, the following scenario is standard for a basic
measurement:
• The live sound is steady and within range. See
Performance" on page A-2. and "Low Level Sound Fields" on
page 7-8..
Before You Start
"SLM
7-3