Duo Smart Noise Monitor Technical Features
Built-in 3G modem
DUO's 3G connection allows for remote access to the measurements in progress
and for download of stored data with no physical presence of the user
required on the site.
Access to stored data
DUO allows for direct connection in order to select the data to download
remotely.
All-weather design
Based on its all-weather design, DUO is intended for both outdoor and indoor
noise monitoring. Collaboration with our partner G.R.A.S. has allowed
developing an all-weather microphone.
Operating lifetime and memory
Its operating life allows for several days of measurements without any
external power supply: more than 60 hours of operating with continuous
acquisition of time and spectral history, 20% audio recording, remote querry
using WiFi or 3G sporadically. Periodic automatic self-check that allows
controlling the operating of the entire instrument and adequate memory
capacity give a new dimension to your measurement campaigns.
Built-in GPS
Stored measurements data are synchronised and geo-referenced.
Automated checks
DUO integrates a unique stand-alone
periodic self-check system for the entire measurement chain that allows
comforting the user on the relevance of the measurements achieved remotely.
Processing of complaints
DUO is compliant with the requirements
for class1 sound level meters according to standard IEC 61672. The type
certification by the French National Testing Laboratory is pending.
Thus, the user has full control over the measurement uncertainties for
undisputable test reports.
Optimised emergence analysis
DUO allows for optimised analysis of emergence by simultaneous use of
several DUO as a measurement points and one or several DUO as trigger
(coding) points based on perfect GPS time synchronisation.
No software option
Our main concern is to make our products easy to use; thus, for DUO, the
user will not have to worry about activating or not such or such option or
not.
Everything is included: unlimited storage within the capacity of the memory
card, frequency analysis, audio recording, 3G modem, WiFi connection, GPS,
dBDUO remote interface.
Detailed
technical specifications
IEC class:
IEC 61672-1 (2002-2005) (0° and 90°)
Dynamic range:
20-137 dB (A, B), 25-137 dB (C), 30-137 dB (Z), 1 range for a rated
sensitivity of 50 mV/Pa
Dynamic range peak:
60-140 dBC, 1 range
Time weighting:
Slow, Fast, Impulse
Frequency weightings:
X=A, B, C, Z ; Y=S, F, I for LXeq et LXY
X=A ; Y=S, F, I for LXYTd
Weighting filters: C, Z for Lpk
Measurements and storage of all indicators
Broadbands:
Logging period T:
Mini 20ms - maxi 60s
Fast logging period: mini 20ms – maxi T, during codes
Spectral analysis:
Measurement and storage in parallel
of Leq and LY (Y=F, S, I)
Filters:
1/1 (8Hz-16kHz) and 1/3 (6.3Hz-20kHz)
Statistics:
7 Ln from L1 to L99, 1 dB resolution
Period T if Leq or 20 ms if LXY
Back erase:
0, 5s ,10s applicable in SLM mode
High-pass filter:
0.3 Hz / 10 Hz
Reference directions:
0° and 90°, selectable
Data storage modes:
SLM (hand-held sound level meter)
and LOG (logging sound level meter)
Audio recording:
Sampling frequency = 51200, 25600,
12800, 6400 Hz
Pre-trigger = 10s at Fs=51200 Hz
Output mini jack stereo 3.5 mm
Audio trigger:
Synchronised with triggers or manual
(using DUO and dBDUO)
Automatic trigger:
Code A
On trigger levels (3 different user-defined periods)
Set-up for pre-trigger, post-trigger, end duration
Manual triggers:
DUO: 1 code
dBDUO: 5 codes
Timers:
Immediate, delayed, periodic
Audio timer
All-weather protected microphone + acoustic
nose cone:
Pre-polarised ½’’ microphone GRAS type
40CD
Stainless steel cone
Preamplifier:
Integrated, not removable
Background noise:
Microphone (thermal noise): 14.5 dBA,
15.3 dBZ
Electronics: 11 dBA, 18.5 dBZ
Total: 16.1 dBA ; 20.2 dBZ
Buttons:
4 silent keys: on/off and 3
multi-function keys
Status Indicators:
LED red (overload)
LED blue (Wi-Fi connection)
LED green (power on)
Display:
High-contrast colour screen 38*50mm
resolution 320*240 pixels
3 sets of colours (day, contrast, night)
USB connection:
Type 2.0; mass storage
Ethernet connection:
Connector RJ45
Protocol TCP/IP
Speed: 100 Mb/s
Wi-Fi connection:
Srandard IEEE 801.11b, g
Analogue output:
Audio: A, B, C or Z
Gain: 0, 10, 20, 30, 40, 50 dB
External microphone input:
7-pin Lemo
Battery:
Type lithium polymer
Voltage 3.7V
Capacity 18.9 Ah
Non removable
Typical power consumption:
Without communication: < 800 mW
+ Wi-Fi: < 1100 mW
+ 3G modem: < 3500 mW
External power supply:
DC from 8 to 28 V
Memory:
SD card up to 32 GB (standard
delivery: 2GB) for measured data and audio
Data stored every minute
Non volatile memory for storage of configurations, system logs,
calibrations (500) and electrical checks (500)
Clock:
Synchronised with GPS, error < 50 ms
Localisation:
Automatic with integrated GPS
Information stored with measurement campaigns
Warm-up time:
From power off: < 25 seconds
Operating temperature:
-10°C +50 °C
Humidity:
IEC 60068-2-78: damp heat : 90% RH
(non condensing at 40°C)
Electromagnetic compatibility:
According to Directive 2004/108/EC
Protection :
IP55
Main functions
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Bulltet points here |
PDF Link here
PICTURE
Product pictures here
