C.1.1 Specification of SV 971A as SLM in the standard configuration
Statement of performance
SV 971A working as SLM with all listed below accessories meets requirements of IEC 61672-1:2013 for the
Class 1 Group X instruments.
Configuration of the complete SLM
SV 971A sound level meter and analyser comprising:
SV 18A microphone preamplifier
ACO 7152 prepolarised free-field microphone (1/2", typical sensitivity
32 mV/Pa, polarization 0 V)
Recommended calibrator:
SV 36 Class 1 sound calibrator 94/114 dB@1000 Hz or equivalent (not
included in the standard set)
Accessories included in the SV 971A instrument set
SC 158 USB-C cable
SA 22 windscreen
Accessories available
SV 36 Class 1 sound calibrator: 94/114 dB@1000 Hz
SP 75 RS232 interface option
SA 271A outdoor microphone kit
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
%), two rolling Leq (LR1 and LR2). Definitions for above mentioned parameters are given in Appendix D.
Additional functions
• Overload indication
• Under-range indication
• Battery state indication
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