Cirrus Optimus Green Series, Instrument Hanbook

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Optimus sound level meter - instrument handbook
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If the Optimus is paused when an automatic timer begins, the new timed measurement
will also be paused.
The single timer allows measurements to automatically stop after a pre-defined period
of time. If you set the single timer duration to 15 minutes and enable the single timer
option, then all measurements will automatically stop after 15 minutes.
(Firmware version 2.8 and above) The single timer can also be set using the NoiseTools
software to halt when the measurement is paused. This allows a measurement to have
an exact ‘non-paused’ duration. For example, if a you set the single timer to two minutes
and pause the measurement for 30 seconds, the measurement will automatically stop
after two minutes and 30 seconds instead of after two minutes.
4.8 Back erase/pause
4.8.1 Pause
The Optimus sound level meters provide pause and back erase functions, which can
be used during a measurement.
When the pause function is enabled in the menu, the ‘stop’ button is replaced by the
‘pause/stop’ button. This also enables the back erase function, the duration of which
can be set in the menu.
Please note that the measurement will automatically resume after five minutes in pause
mode.
4.8.2 Back erase
The back erase function allows a section of the measurement to be removed from the
data used, to calculate the overall values.
An example of this would be if, during the measurement of cars on a road, a large
truck passed by the measurement location. If the intention was only to measure cars,
the truck can be excluded from the overall measurement data by pressing the ‘pause’
button and then using back erase to remove a preset section of noise.
The time that the ‘pause’ button was pressed, along with the back erase duration, will
be excluded from the calculation of the overall noise values such as the Leq, Lmin,
Lmax, LPeak, and the 1:1 and 1:3 octave band overall values.
The duration of the back erase can be set to between one and 30 seconds using the
menu, and can also be configured in the NoiseTools software. If the pause function is
disabled, the back erase function is also disabled.