Integration period
The Integration Period position defines the period during
which the signal is being measured (averaged) and
measured results stored as the set of Summary Results.
The measurement will stop automatically after this period.
When the Repetition cycle is greater than one, the
measurement will start again.
When INFINITE is selected, the measurement will run until
the user stops it manually.
RMS Integration
The RMS Integration position defines the detector type for
calculation of the Leq, LEPd, Lnn and SEL results. Two
options are available: Linear and Exponential. The
formulae used for results calculation are given in
Appendix D.
The Linear integration is used when it is required to obtain
the true RMS value of the measured signal. When this option
is selected the value of the Leq, LEPd, Lnn and SEL results
do not depend on the detector time constant: Fast, Slow or
Impulse.
The Exponential integration enables fulfilling the requirements of other standards for the time averaged
Leq measurements. When this option is selected value of the Leq, LEPd, Lnn and SEL functions depends
on the detector time constant: Fast, Slow or Impulse.
Repetition cycles
The Repetition cycles position defines the number of cycles
(with the measurement period defined by
Integration Period) to be performed by the instrument. The
Repetition cycles number values are within limits
[INFINITE, 1, 1000]. INFINITE means that the instrument will
repeat the measurements until it will be stopped manually.
Outdoor filter
The Outdoor filter setting enables selecting the appropriate
compensation filter. The characteristics of the outdoor filter
depend on the application: Environment (acoustic signal is
parallel to the microphone’s grid) or Airport (acoustic signal
is perpendicular to the microphone’s grid). The frequency
characteristics of the filters are given in Appendix C.
9.8.3 Channels
In this tab, filter and RMS detector can be selected for each acoustic profile individually. Due to this,
three results with different filter and detector can be obtained simultaneously. When 1/1 Octave or 1/3
Octave functions are selected, frequency weighting filter for 1/1 & 1/3 octave analysis can also be
defined.
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