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). To control the instrument and
readout results, it is recommended to use the Assistant smartphone application.
In the case of significant differences between the instrument’s temperature and the ambient temperature at the
measuring 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 menu (see Chapter
4.5).
When measuring in the diffusion field (in small spaces) it is recommended to switch on the filter for the diffusion
field.
The IEC 61672-1:2013 standard advises users to perform in-situ checks
(System Check) of measuring instruments before starting measurements
using the recommended sound calibrator. If the System Check gives
negative result, then it is necessary to perform calibration of the instrument
(see Chapter 3.3).
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