SVAN 948 USER MANUAL .
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The detailed description of the elements of the SETUP list is presented in Chapter 5. For sound
level measurements two positions are important: the setting of the RMS INTEGRATION parameter and
the setting of the correction filter for the diffuse field performed in the FIELD CORRECTION. For vibration
level measurements three positions are important: the setting of the RMS INTEGRATION parameter, the
REFERENCE LEVEL and the VIBRATION UNITS.
The RMS INTEGRATION position enables the user to select the detector type for the calculations
of the LEQ function. The formulae used for the LEQ calculation are given in Appendix D.
a)
b) c)
The view of the displays in the SETUP list (path: MENU / SETUP) (a) and with the possible options of RMS
INTEGRATION (b), (c)
The selection of the LINEAR option causes that the LEQ, SEL and Ld(en) results does not depend
on the detector time constant set in any channel. Other results, i.e. the SPL value, depend on, which is
presented on the display by displaying the name of the detector which was used during the calculations.
The PEAK value never depends on the detector time constant.
The view of the displays in the case when the LINEAR option is selected in the RMS INTEGRATION
The selection of the EXPONENTIAL option causes that the LEQ, SEL and Ld(en) results depend
on the detector time constant set in any channel as well as the other results (i.e. the SPL value), which is
presented on the display by displaying the name of the detector which was used during the calculations.
The PEAK value never depends on the detector time constant.
The view of the displays in the case when the EXPONENTIAL option is selected in the RMS INTEGRATION
The FIELD CORRECTION enables the user to set the proper conditions for making the
measurements in the diffuse field. In this position two options are available: FREE (for the measurement
performed in the free field conditions) and DIFFUSE (for the measurement performed in the diffuse field
conditions). The microphone supplied with the SVAN 948 instrument (SV 22) is designed for the
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