Audio performance
The Ranos dB’s accuracy and per
formance is high, as is necessary to
meet IEC 61672-1:2104 Class 1 and
2 specifications. The Ranos dB has
a dynamic range of 40 - 120 dB(A)
and a usable frequency range of past
the human hearing limits of 20Hz to
20kHz. Available frequency and time
weightings are A, C, Fast, Slow and
Leq. The calculations run at the audio
sample rate of 48 kHz.
Electret condenser microphone
The microphone is of an electret
condenser microphone type. Its key
features are the performance to
cost ratio, its IP67 rating and its
omnidirectional free-field sound
field characteristics. Optionally the
microphone can be detached from
the housing to be mounted at any
desired location. Additionally, a 1.5
meter, 3.0 meter and 5.0 meter
microphone extension cable is
available.
IEC 61672-1:2014 standard
The Ranos dB 1 and Ranos dB meet
the class 1 and class 2 performance
specifications of the IEC 61672-1:2014
standard.
Sustainable housing
Highly rigid and using plastic HIPS,
the housing is lightweight and quite
suitable for years of intensive use.
HIPS (High Impact PolyStyrene)
has a fire retardant effect. This is
an absolute requirement because
a lead acid battery is used as a
backup.
Waterproof
All parts are rated IP67 or better.
This makes the Ranos dB immer
sionproof. The interior is vented
through special membranes which
only lets through gasses.
Solar powered
The Ranos dB is highly energy
efficient. The power consumption is
low and every bit of available solar
energy is harvested and stored in a
battery by making use of an efficient
MPPT (Maximum Power Point
Tracking) algorithm. For applications
where solar irradiation is low, power
consumption can be further reduced
by optimizing the settings. The LoRa
transmission interval can be
increased and the GPS can be
turned off.
Sealed Lead Acid (SLA) battery
Whenever no solar power is availa
ble, the Ranos dB runs off of a SLA
battery. An SLA type battery is used
for its wide temperature range, cost
efficiency and it is available across
the whole world.
LoRa network
The Ranos dB communicates via
LoRa. We can deliver to all LoRa
(frequency) regions in the world.
The device is suitable for LoRaWAN
Class C networks, allowing the cloud
server to send direct messages to the
Ranos dB. This enables continuous
adjustability of measurement settings,
characteristics and network
configurations.
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