Bedrock SM50 - 18 Technical Specifications

80 Bedrock SMxx operating manual © Bedrock Audio BV, 2019
18. Technical specifications
Functionality
Speech Transmission Index (STIPA and Full STI)*
Speech Level Meter (IEC-60268-16)*
Sound Pressure Level meter (A, Z, slow, fast, Leq, pk)
LAEQ logging and long-term monitoring
1/1, 1/3, 1/6 and 1/12 octave RTA
RTA logging
FFT analyzer
RT60 reverb time measurements
Noise curves (NR, NC, PNC, NCB, RC, RCmarkII)
Oscilloscope
AC volt meter (Vrms, dBU, dBV)
USB audio device mode
Remote operation via USB
* not featured on SM30
Standards compliance
IEC 60268-16 rev. 4, IEC 61260 (class 0), ISO 3382-2, ANSI S12.2,
ISO-1996
SM30/SM50: IEC-61672 Group X Class 2; ANSI S1.4 Type 2
SM90: IEC-61672 Group X Class 1; ANSI S1.4 Type 1
RTA filter specifica-
tions (IEC-61260)
Class 1 1/1, 1/3, 1/6 and 1/12 octave filters (base 10)
Acoustic specs device
Effective noise floor: < 25 dB(A) for class I devices (SM90) or <30
dB(A) for class II devices (SM30/SM50).
Upper limit peak range: 124 dB (highest range, 20 Hz - 20 kHz)
Linear range: See separate table below
Maximum permissible sound pressure level is 155 dB
Maximum electric input signal is 30 Vpp
Microphone specs
(SM30/SM50)
Microphone type BAMT2, 48V phantom powered
1/4” omnidirectional free-field microphone
Conforms with class 2 / type 2 requirements
30 mV/Pa sensitivity
Microphone specs
(SM90)
Microphone type BAMT1-MP201, 48V phantom powered
1/2” omnidirectional free-field microphone
Detachable IEC 61094-4 Type WS rear-vented mic capsule
Capsule housing alloy, diaphragm nickel
Conforms with class 1 / type 1 requirements
Capacitance 16 pF
50 mV/Pa sensitivity
Dynamic range (3% distortion limit) > 146 dB
Temperature Coefficient: -0.012 dB/°C
Pressure Coefficient (250 Hz): - 0.004 dB/kPa
Display
Resistive LCD touch screen
320x240 pixels, 65k colors
Luminance typ. 250 Cd/m2
Durability: 100k finger slides, 1M taps