SmartSMS User Manual
Soft dB inc.
User Manual
p. 59
General operation of the analyzer
Starts (and stops) the spectrum averaging measurement. The spectrum
shown is given in dBLin (without A or C weighting), and the overall SPL is
given in dBA.
Use this button to restart the averaging, if necessary (for example, when an
important undesired noise occurred during the measurement).
The result spectrum presented is the Leq (mean value over the acquisition
time specified). The statistical L1%, L5%, L10%, L50%, L90%, L95% and
L99% spectrum levels are also available.
This control allows the Averaging Time to be changed. The default
averaging time is 10 seconds.
Linear and Exponential averaging types are available. The Linear mode
calculates an average of the SPL where each sample measured during the
averaging period has the same weight. At the end of the period, the
averaging automatically stops. The Exponential mode produces a running
time-averaging process (over the Averaging Time period) in which the last
SPL measured has more weight then the previous measurements.
The first field shows the frequency band selected by the red cursor on the
graph. The second field shows the level of this band. The red cursor on the
graph can be moved with the use of the arrow push buttons, or by directly
selecting and moving the cursor on the graph.
Use this button to export the frequency graph data for further analysis and
for reports.
Use the Time tab to see the instant time signal, which can be useful to
verify the presence of a signal at the input.
