Calibration Displays - Larson Davis SoundAdvisor 831C Reference Manual

5.2 Calibration Displays

Calibration
LEARN MORE
Histories can be viewed in
more detail using G4 LD
Utility.
5.2.1 Calibrate Page
FIGURE 5-1 Calibrate
Select the correct
calibrator you will be
using for the calibration.
Turn the calibrator on,
place over microphone,
and press Do Calibration
to begin.
SoundAdvisor Model 831C
During calibration, an automatic comparison is made between the
sensitivity determined by the calibration and the previous value. A
warning will appear when the difference between these two values
exceeds 3 dB.
The Calibrate function has four pages: Calibrate, Calibration Settings,
Calibration History, and Calibration Certification.
Before performing a calibration, visit all pages and ensure that the
settings are correct, this will prevent any errors that may occur. To
access the calibration functions on the SoundAdvisor, navigate Tools
MenuCalibrate.
Under Range
The Under Range Level is the higher of the following:
1. Noise Floor plus 9.14 dB (under range shown when self noise con-
tributes ≥ 0.5 dB to the readings).
2. Actual point where the log-linearity exceeds maximum permitted
value.
Except for very low noise level microphones, the under range level
is usually determined by the noise floor plus 9.14 dB.
Noise Floor
The noise floor is calculated as the energy sum of microphone self
noise, preamplifier self noise and instrument self noise. The
appropriate noise floor, as well as the nominal sensitivity, is computed
Calibration Displays
The microphone type,
sensitivity, and peak
overload values are
available on this page
The under range and
noise floor capabilities.
5-2