Bedrock SM50 User manual
Bedrock SM30/SM50/SM90
Operating manual
© 2019 Bedrock Audio BV Document version 2.4.0
IEC-60268-16 rev. 4 & rev. 5
IEC-61672 Class 2 / ANSI S1.4 Type 2
IEC-61260 Class 0
ISO-3382-2
ANSI S12.2 / ISO-1996
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Contact information and support
The Bedrock SMxx devices (SM30, SM50, SM90) are designed and manufactured by Em-
bedded Acoustics B.V. in the Netherlands.
The manufacturer can be contacted at the following address:
Bedrock Audio BV
Ampèreweg 18
2627 BG DELFT
The Netherlands
www.bedrock-audio.com
Phone: +31 88 8770700
Fax: +31 88 8770799
Email: [email protected]
Updates of the system’s firmware and documentation are released online :
www.bedrock-audio.com/support
NOTE: All screenshots and product pictures shown in this manual correspond to the
SM50 with hardware platform 1.1B running firmware version 2.4. If you are using a differ-
ent device model or a different firmware version, the screenshots may not fully correspond
to what is being displayed on your device’s screen.
Where this manual refers generically to the Bedrock SMxx, the corresponding text ap-
plies to all device models starting with the letters “SM” (i.e. SM30, SM50 and SM90).
All functions and features of the SM30 are identical to the SM50, with the exception of
the STIPA modules (which are not featured on the SM30). The SM90 hardware differs
from the other two models: it complies with Type 1/ Class 1 requirements (compared to
Type 2 / Class 2 for the other models).
© Bedrock Audio BV, 2013-2019. All rights reserved.
Bedrock Audio and Embedded Acoustics are registered trademarks.
Document version 2.4.0 release date April 2019. Applies to models: SM30, SM50 and
SM90. Speech intelligibility related functions not supported on SM30
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Contents
Contact information and support 3
1. Introduction 6
2. SMxx versions and features 7
3. How to use this manual 8
New in firmware version 2.4 8
4. General use and safety precautions 9
4.1. Safety precautions when charging 9
4.2. Safety precautions related to connectors 10
5. Getting started 11
5.1. Preparing and booting the SMxx 11
5.2. The SMxx main menu 11
5.3. Customizing the main menu 13
5.4. Warning dialogs 13
5.5. Layout of the user interface 14
5.6. Some more tips and tricks 15
6. Speech intelligibility measurements 16
6.1 Quick STIPA (not featured on the Bedrock SM30) 16
6.2 STIPA pro (not featured on the Bedrock SM30) 20
6.3 Full STI (not featured on the Bedrock SM30) 24
6.4 Speech Level Meter (not featured on the Bedrock SM30) 27
7. Level and spectrum 28
7.1 SPL meter 28
7.2. LAEQ logging 31
7.3. Real-Time Analyzer (RTA) 35
7.4. Fast Fourier Transform analyzer 37
7.5. Statistical acoustics (percentiles) 39
7.6. RTA logging (button) 41
8. Room acoustics 42
8.1. Reverberation Time meter (RT60) 42
8.2. Noise curves 49
9. Electro-acoustics 52
9.1. Oscilloscope 52
9.2. AC Volt meter 53
9.3. Electric in RTA and FFT 54
9.4. Polarity 54
10. Other modules and control modes 56
10.1. Calibration 56
10.2. Settings 58
10.3. Status 62
10.4. USB audio device mode 63
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11. Accessing saved measurements from a PC 64
11.1. Connect USB cable 64
11.2. Copy your measurement data 64
11.3. Resetting measurement number series 65
11.4. About the file format 65
11.5. Downloading recorded audio 65
11.6. Further use of USB 65
12. Remote control from a PC 66
12.1. Remote duplication of the SMxx screen (Remote display) 66
12.2. The Bedrock remote control API 68
13. Power and charging 70
13.1. Charging instructions 70
13.2. Power saving recommendations 71
13.3. Use of power banks and external battery packs 71
14. Cleaning, maintenance and calibration 72
Battery disposal 72
15. Product warranty 73
16. Firmware updates 75
17. Buttons, icons and symbols 76
18. Technical specifications 80
Linear range (31 Hz - 4k - 8k - 12.5kHz) 81
19. Troubleshooting 82
LED states 83
Firmware update error codes 83
EC declaration of conformity 84
Annex A. Correction factors for SPL measurements (IEC-61672) 85
Annex B. Manufacturer’s instructions for periodic testing according to IEC-61672-3. 98
Annex C. Manufacturer’s instructions for periodic validation of STI test functions 100
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Class 2 / type 2
microphone
Power button
Charge status LED
USB charge & data
port
Touch screen
Tripod mount
Hook for
carrying cord
Serial number Model shown is
Bedrock SM50
1. Introduction
Congratulations on purchasing your Bedrock measuring instrument! The SMxx product
line comprises a series of flexible, all-round acoustic analyzers: the SM30, SM50 and SM90.
The features of each of these instruments are listed in section 2 of this manual.
Using the SMxx is quite easy, thanks to its touch-screen operation and intuitive menu
structure. Most users will get the hang of doing measurements with the SMxx without
spending too much time with this manual. Nonetheless, we strongly recommend that you
do read chapters 1-5 of this manual before using your SMxx for the first time, in order to
get acquainted with the various features of the device, as well as the procedures for charging
and maintenance. With a little care, you can expect years and years of reliable and trouble-
free operation from the SMxx.
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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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3. How to use this manual
Depending on how you plan to use your Bedrock SMxx, not all information in this manual
may be equally interesting or relevant. If you are new to the Bedrock SMxx, we strongly
recommend that you read the following chapters:
• Chapter 4: General use and safety precautions
• Chapter 5: Getting started
• Chapters on the measurement modules that you plan to use first
• Chapter 13: Power and charging
• Chapter 14: Cleaning, maintenance and calibration
We recommend reading the chapters on the various measurement modules as you plan to
use them. As some of the modules implement complex measurement procedures, using
those modules may require you to spend some time with this manual, and possibly also
third-party source of information (such as online tutorials and course manuals).
The following sections should be read if you are experiencing issues with your device or if
you need to upgrade your firmware:
• Before getting support from your Bedrock audio vendor, please consult the
Troubleshooting section (chapter 19)
• Consult the section on Firmware updates (chapter 16) before trying to in-
stall new firmware on your device. Failure to follow firmware update in-
structions precisely may render your device permanently inoperable and
voids your warranty.
Towards the end of this manual, you will find detailed information in tables and appendi-
ces that may not be needed for everyday use of the device. In particular, these appendices
contain procedures for periodic testing, as needed by 3rd party labs for calibration and (re-)
certification of your instrument.
New in firmware version 2.4
If you have previously used the Bedrock SMxx but have recently upgrade to firmware 2.x.x
we recommend that you read the “Getting started” section to get acquainted with the new
structure of the Home menu (which is now user-configurable). New modules introduced
in FW2.x.x are: Speech Level Meter, Full STI, AC Volt meter, Noise Curves and RTA log-
ging. Functionality of RT60 has been enhanced, and a remote control API for 3rd party
apps is now available. Full STI and Speech Level Meter are not available to SM30 users.
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4. General use and safety precautions
Your Bedrock SMxx is a sophisticated electronic measuring instrument that should be used,
maintained and stored with care:
• We recommend that you always use a lanyard to secure your device against
dropping, by suspending it around your neck or wrist. If you use a tripod
to mount the device during measurements, we recommend that you use a
sturdy model with a sufficiently wide base.
• Do not expose the device itself, the measuring microphone or charger to
rain, moisture or liquids of any kind. Take special care to prevent liquids to
permeate into the device through the connectors or along the display bezel.
• Do not operate at ambient temperatures above 35oC/95F.
• Do not use close to flames or open fire.
• Do not use in environments where flammable or explosive materials may
also be used.
• Do not keep the device powered on while unattended for prolonged periods
of time.
• Use the charger only with the international adapter suitable for your region.
• Make sure that the device is switched off before transportation and storage.
• During transportation and storage, keep the device in a suitable casing or
container – preferably its original case. The device needs to be protected
from shocks and vibration (due to transportation or falling), excessive tem-
peratures, liquids and moisture, and any other external conditions that
could do damage to the device. Care should be taken that other objects can-
not come into direct contact with the display during transportation.
4.1. Safety precautions when charging
The Bedrock SMxx is a battery-powered rechargeable device, with an internal low self-
discharge NiMH battery pack. This battery pack is designed for many years of operation,
and therefore cannot be swapped out by the user. Recharging takes place through the mini
USB connector found on the left side of the device.
The device is charged through the USB connector using high currents of
up to 1500 mA. While being charged, it will heat up. DO NOT CHARGE
THE DEVICE WHILE IT IS INSIDE A CLOSED CONTAINER (BOX,
BRIEFCASE, ETC.). Please make sure that the device can shed excess heat
while charging.
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The supplied charger includes adapters for use worldwide, and operates on
a wide AC voltage range of 100 – 240V. Do not use the charger if the casing
appears cracked or broken, or if it has been exposed to fluids or moisture.
Contact with components inside the charger while this is plugged in may
result in serious injury or death.
4.2. Safety precautions related to connectors
The Bedrock SMxx features a USB connector and an XLR connector (to
which the microphone is attached). If you connect external devices to these
connectors, please ensure that these connections are protected against over-
voltage and power surges. The voltage supplied to the USB port may not
exceed 5.5V. As the USB power circuitry is connected to the battery pack,
excessive voltage applied to the USB port may cause the battery pack to
catch fire or explode.
The XLR connector supplies 48V phantom power to the microphone. This
phantom voltage can be switched on and off through the hardware settings
menu. IMPORTANT: connecting equipment not designed for 48V phan-
tom power to the XLR connector (with phantom power switched on) may
permanently damage the connected device and/or the SMxx. The manu-
facturer explicitly denounces responsibility for any damages to third-party
hardware resulting from exposure to the Bedrock SMxx’s phantom power.
The “AC Volt meter” function of the device is intended for measuring audio
output levels of amplifiers and other audio equipment. NEVER connect the
XLR input pins to AC voltages over 40V; do NOT try to measure the AC
mains with your SMxx.
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