Accessories included in the SV 973 instrument set
ST 973 MEMS microphone
SC 158 USB-C cable
SA 22 windscreen
SA 80 pocket soft bag
Accessories available
SV 34B Class 2 sound calibrator: 114 dB/1000 Hz
SP 75 RS232 interface option for SV 973
SA 72 carrying case for SV 973 and accessories (waterproof)
Statement of performance
SV 973 working as SLM with all accessories meets requirements of IEC 61672:2013 for Class 2 Group X
instruments.
Configuration of the complete SLM in its normal mode of operation
SV 973 including the ST 973 microphone (1/2", nominal sensitivity 11 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 SLM mode are: LXpeak, LXYmax, LXYmin, LXY, LXeq, LXE, Lden, LEPd,
Ltm3, Ltm5, Ln (Leq statistics), EX (expected Leq value), SD (standard Leq deviation), OVL (overload time
%), LR15 (running Leq for 15 minutes) and LR60 (running Leq for 60 minutes). 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.
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