6 Bedrock SMxx operating manual © Bedrock Audio BV, 2019
7
2. SMxx versions and features
The SM30, SM50 and SM90 share a common hardware platform, with some differences
between the different versions of the device:
• The SM30 and SM50 comply with class 2 / type 2 (Group X) of IEC-61672:2013 and
ANSI S1.4. The SM90 complies with class 1 / type 1.
• The SM50 and SM90 feature speech intelligibility measurement functions. The SM30
does not include any of the modules related to speech intelligibility.
The table below lists all of the functions and modules
Modules and features SM30 SM50 SM90
Speech intelligibility
STIPA measurements (IEC-60268-16) - • •
Full STI measurements (IEC-60268-16) - • •
Speech Level measurements (IEC-60268-16) - • •
Level & spectrum
SLM: Sound Level Meter (IEC-61672 / ANSI S1.4) class 2 class 2 class 1
LAEQ logging (long term monitoring) • • •
RTA: Realtime Analyzer, 1/1, 1/3, 1/6 and 1/12 oct. • • •
RTA logging: long term monitoring of RTA spectra • • •
FFT: Fast Fourier Transform spectral analyzer • • •
L% - statistical acoustics (percentile levels) such as L10 and L90 • • •
Room Acoustics
RT60: Reverberation Time measurements (ISO-3382-2), IR-based and interrupted noise • • •
Noise curves (NR, NC, etc - ISO-1996, ANSI S12.2) • • •
Electro-acoustics
Oscilloscope (time domain inspection of signals) • • •
AC Voltmeter (measure RMS, dBU, dBV) • • •
RTA (Real-Time analyzer) for electric input signals • • •
FFT (Fast Fourier Transform) for electric input signals • • •
Polarity - check polarity of loudspeakers • • •
Other options and features
Recording calibrated audio • • •
Remote operation as USB audio device • • •
Remote control via PC • • •
Availability of remote control API for third-party applications • • •
Download of measured data via USB • • •
User-configurable home menu • • •
Free firmware upgrades • • •
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