Measured quantities
The measured quantities for SLM mode are PEAK, SPL, MAX, MIN, LEQ, RMS, SEL, Ltm3, Ltm5, LEPd,
OVL, Ln and additional, for DOSE METER modes are: DOSE, D8_h, LAV, TLAV, SEL8, PSEL, E, E_8h.
Definitions for parameters are given in Appendix D.
Additional features
• Overload indication
• Underrange indication
• Battery state indication
Normal operating mode
SVAN 958A in configuration with the SV 12L microphone preamplifier, MK 255 microphone for each channel
and the SC 26 extension cable for Channel 4 or SC 49 cable for Channels 1-3 and with following settings:
High or Low measurement range, microphone compensation set to Free Field (path: <Menu> /
Channel Setup / Channel x – see Chapter
4.2)
Conformance testing
This chapter contains the information needed to conduct conformance testing according to the specified
standards.
Mounting for acoustical tests
The microphone with the preamplifier should be placed on a tripod (i.e. the SA 21) and connected to the SLM
using the SC 26 (Channel 4) or SC 49 (Channels 1-3) extension cable.
The operator shall stand in proper distance from the tripod in order not to disturb acoustic field around
the microphone.
Periodical test upper frequency 8 kHz
Measurement ranges
Reference measurement range of the acoustic pressure High
Measurement frequency range of the acoustic pressure 3 Hz ÷ 20 000 Hz (-3 dB)
Basic measurement error of the acoustic pressure < 0.7 dB (measured for the reference
conditions, see below).
Weighting filters (see part C.4)
• LIN meeting requirements of IEC 61672-1:2013 for the Class 1 “Z“ filters
• A meeting requirements of IEC 651 and IEC 61672-1:2013 for the Class 1 “A“ filters
• C meeting requirements of IEC 651 and IEC 61672-1:2013 for the Class 1 “C“ filters
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