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SM90 Class 1 Measuring Instrument

The Bedrock SM90 is a versatile class 1/type 1 acoustic measuring instrument, suitable for a wide variety of applications. With its high-quality 1/2″ pre polarised microphone capsule, it is the instrument of choice whenever accurate and reliable acoustic measurements are required. The Bedrock SM90 conforms with class 1 requirements as a Sound Level Meter (IEC 616272), but also offers a variety of other functions.

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The Bedrock SM90 is an all-round measuring solution for everybody who requires the highest levels of accuracy and performance. Combined with its competitive pricing, this makes the Bedrock SM90 an attractive addition to every consultant’s and acousticians toolbox.

Functionality

Class 1/Type 1 sound level meter (fast, slow, A/C.Z-weighting, Leq) conforming to IEC-61672 class 1, ANSI S1.4 Type 1
STIPA measuring (quick screening mode, pro mode)
Full STI using the direct method (65-second measurement). With firmware 2.0
Speech Level Measurements cf IEC-60268 Annex J. With firmware 2.0
Real-Time Analyser (1/3 and 1/1 octave)
FFT analyser (detailed frequency analysis up to 32768 lines)
RT60 measuring (reverberation times: T20/T30/EDT)
Noise Curves (NR, NC, PNC, NCB, RC, RC mark II) With firmware 2.0
Calibrated audio recording
LAeq long-term logging and monitoring
Audio oscilloscope
AC Volt meter for audio line level measurements (dBU, dBV, V rms) With firmware 2.0
USB audio device mode – calibrated audio for your PC-based software applications
More functionality will be added through free future firmware upgrades

20 – 20.000 Hz frequency range
Dynamic range 20-130 dB (with included microphone; up to 145 with attenuator sold separately)
Full-colour resistive LCD touch screen (240×230 px)
8 GB of storage (of which at least 95% available for user data)
Access to stored data and recorded audio through high-speed USB2.0 interface
Integrated long-life battery pack, rechargeable via USB
Complies with IEC 60268-16 rev. 4, IEC 61672 Class 1, ANSI S1.4 Type 1, IEC-62160 class 0 (RTA), ISO-3382
All necessary accessories (such as microphone, charger, cables, windscreen and a ruggedized waterproof carrying case) are included

The Bedrock SM90 shares its main platform with the proven design of the Bedrock SM50 and SM30. However, the SM90 has been designed and tested to comply with class 1 requirements throughout. Its detachable microphone capsule is interchangeable with most common types high-end UNC capsules by other manufacturers.

SM90 datasheet