Statement of performance
SV 973 working as SEM with all accessories meets requirements of IEC 61252 and IEC 61672:2013 for
Class 2 Group X instruments.
Configuration of the complete SEM in its normal mode of operation
SV 973 including, ST 973 microphone (1/2", nominal sensitivity 1.8 mV/Pa)
Recommended calibrator:
SV 34B Class 2 sound calibrator 114 dB@1000 Hz or equivalent (not included in the standard set)
Measured quantities
The measured quantities for SEM mode are: : LXpeak, LXYmax, LXYmin, LXY, LXeq, LXE, Lden, LEPd,
Ltm3, Ltm5, Ln (Leq statistics), Lc-a, DOSE, D_8h, PrDOSE, LAV, LAE8 (SEL8), PLAE (PSEL), E, E_8h,
PTC (peak counter), PTP (peak threshold), ULT (upper limit time), TWA, PrTWA, EX (expected Leq value),
SD (standard Leq deviation), OVL (overload time %). Definitions for above mentioned parameters are given
in Appendix D.
Additional features
Overload indication
Under-range indication
Battery state indication
Conformance testing
This chapter contains the information needed to conduct conformance testing according to the specified
standards.
Mounting for acoustical tests The microphone must be mounted on the instrument.
Electrical substitute for the microphone To obtain a BNC Class electrical input, the microphone
must be replaced by an electrical microphone impedance
adapter SL 973.
Note: For the frequency response evaluation in the acoustic
coupler the microphone compensation must be switched on
(Microphone=On) and the Free-filed compensations must be
switched off (Field Comp=Off).
The Windscreen compensation is switching off automatically.
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