The instrument's normal operating mode as SLM assumes operating with a preamplifier and a microphone
attached to the instrument and without a windscreen. Optionally the instrument can be operated with the
windscreen attached to the microphone or with the preamplifier and microphone fitted in the outdoor
microphone kit and connected with the instrument by the extension cable (see Appendix C.7 for specification).
During sound measurements, to meet the requirements of the Class 1 accuracy, it is recommended to install
the instrument on a tripod or in a holder to minimize the possibility of reflection and diffraction of acoustic waves.
In particular, the instrument must not be held close to the body of the person performing the measurement. The
instrument should be directed so that the microphone diaphragm plane is perpendicular to the direction of the
measured sound source (the incidence angle of the sound wave is 0 degree).
In the case of significant differences between the instrument’s temperature and the ambient temperature at the
measurement point, long enough acclimatization of the instrument is recommended so that its temperature is
as close to the ambient temperature as possible.
In the case of measurements in the presence of wind, it is necessary to use a windscreen. The windscreen
should be simply installed over the microphone with the preamplifier without any significant force.
To have measurements in accordance with the IEC 61672-1:2013 standard it is necessary to set the
appropriate compensation in the Compensation Filter screen (see Chapter 4.6).
When measuring in the diffusion field (in small spaces) it is recommended to switch on the filter for the diffusion
field.
Before starting measurements, the instrument should be calibrated
using the recommended sound calibrator (see Chapter 3.3).
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