Cirrus Optimus+, Instrument Handbook

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Page 27
Sound Level Meters – User Manual
For more information, please see Technical Note 32 – Tonal noise detection with Optimus sound
level meters, available for download from the Cirrus Research website at
www.cirrusresearch.co.uk/library/optimus/.
5.1.7 Ln view
The Ln view shows the statistical Ln values calculated during the measurement. The first seven
Ln values are set by default to commonly used values, and 8-14 are definable in NoiseTools.
Some Optimus models have a second set which are also 1-7 default, 8-14 user definable.
The source data type for the second Ln set is also configurable in NoiseTools
5.1.8 Dose view
The dose view gives you a number of different functions depending upon the configuration of
the quick settings.
For the UK option, this view gives you Leq, LEP,d, % dose and estimated dose along with the
projected exposure calculator.
For the EU option, this view gives you Leq, LEX,8, % dose and estimated dose along with the
projected exposure calculator.
For all other options the Lavg, TWA, % dose and estimated % dose for two integrators, in addition
to ISO (EU), will be shown according to the setting you have chosen.
Two custom integrators can also be used, configured in NoiseTools. When chosen, they will be
shown in addition to ISO (EU).
5.1.9 Moving average view
The moving average view is available on the CR:19xBE instruments only.
The moving average view shows a 15 minute and 60 minute moving average LAeq along with
LASMax and L95 values.
The moving average LAeq values are highlighted in colours under certain conditions (see pages
37 for more details).
5.1.10 Environmental view
The environmental view provides quick access to a set of parameters that are commonly used
for environmental noise measurements.