Performing The Measurement - Larson Davis SoundAdvisor 831C Reference Manual

7.3 Performing the Measurement

To learn more
LEARN MORE
about the displays and icons,
see "Displays and Icons" on
page 2-6.
Keypad LED Indicators
Table 7.1 Measurement State LED Indicators
Measurement State
Stopped
Paused
Running
Waiting for valid
data to begin
running
The Measurement Range
SoundAdvisor Model 831C
At this point you are ready to begin a measurement.
Navigate to Overall on the SoundAdvisor and press RUN 9.
When performing a measurement, the state of the SoundAdvisor is
indicated in several ways: measurement state icon, Overall display
animation, and the red and green illumination of the STOP/STORE and
RUN/PAUSE keys.
Red LED 7
Winking **-*-*
Flashing
Off
Delayed
wink
The measurement ranges over which the SoundAdvisor meets the
standards depends upon the selected frequency weighting.
Measurements which include levels outside this range should not be
considered accurate. An overload indication will appear when levels
are above the range. However, it isn't recommended to rely on
measurements where the levels are below the lower limit of the
specified range.
Overload
As part of the calibration procedure, the overload level (dB Peak) and
the under range sound pressure levels for A, C and Z weighting are
determined for the instrument setup and microphone/preamplifier
combination being used. When a signal from the preamplifier exceeds
the calibrated input range of the SoundAdvisor, an overload condition
exists. To learn more see "Input Overload Icon" on page 2-9.
Under Range
When the signal from the preamplifier drops to the point where the
noise level of the instrument and the preamplifier influence the
measurement, an under range condition exists. To learn more, see
"Under Range Icon" on page 2-10.

Performing the Measurement

Green LED 9
Off
*-*- Flashing
Winking
----* Off
-*-*
**-*-*
7-5