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Sound Level Meters – User Manual
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 pre-set 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.
4.9 Memory
The instrument has 4GB of memory as standard. This is partitioned into two sections, one to
record time history and one for audio (VoiceTags and audio recordings). The space allocated to
each can be configured in NoiseTools.
The free space in the memory is shown in the general view as days or hours available for both
time history and audio. When either partition is full, the instrument will overwrite the oldest data
in that partition.
To clear the memory and permanently delete all stored data, choose the ‘clear memory’ menu
page and follow the instructions on-screen. Before permanently erasing the data, you will be
asked to press ‘OK’ to confirm.
4.10 Restore factory settings
This is in the ‘Advanced Options’ menu and restores the instrument to the default options for all
user-definable settings in the menus, and clears the calibration offset. For settings such as
‘language’ where there is no default, the instrument will return to the option it was shipped with.
Follow the on-screen instructions, and press ‘OK’ to confirm. This does not delete any stored
measurements.
4.11 Windshield
The instrument can be used with a UA:237 90mm foam windshield, which will reduce the noise
levels generated by air turbulence over the microphone capsule. It can also help protect the
microphone capsule from dust and fluids, which can affect the performance of the instrument.
Summary of Contents for Optimus+
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