A H I G H P E R F O R M A N C E S C I E N T I F I C P OW E R H O U S E
T R U E I N N O VAT I O N M A K E S A D I F F E R E N C E
www.nortek-as.com
Signature1000 and Signature500, two advanced
five-beam current profiling systems, are made
with the most demanding scientific user in
mind. Built on the entirely new AD2CP platform,
Signature1000 and Signature500 are designed
for unprecedented performance in high energy
turbulent environments, while also giving users
the freedom to employ two measurement
schemes at one time.
Built for Collaborative Researchers
In addition to choosing from a variety of measurement
modes to employ, Signature1000 and Signature500
users may also invite collaborators to run other sampling
schemes simultaneously. If a researcher is interested solely
in average current profiles, he or she is easily able to collect
these while a colleague interested in turbulence estimation
can utilize the burst mode simultaneously along the vertical
beam at 8 Hz.
Built with Flexibility in Mind
Signature1000 and Signature500 employ a timing scheme allowing the user to fit a given number of data points into one
second. This one-second sampling period is composed of 16 slots in Signature1000 and 8 slots in Signature500. The data
points selected and the frequency at which each is sampled is determined by the user. Users may choose from a variety of
measurement modes to employ within these available data slots.
Average Mode
Burst Mode
Altimeter
Signature1000 and Signature500
sample currents along four beams
slanted at 25 degrees from vertical,
as well as along a fifth vertical beam.
In order to avoid cross interference
and small bias errors, the instrument
multiplexes the four slanted beams
with the vertical beam. The most
basic measurement mode employed
by Signature1000 and Signature500
is average current profiling. This is
achieved by sampling currents along
the slanted beams in the available data
slots within each sampling period.
Rapid sampling of one or more
beams is done in burst mode. Here,
it is possible to use the available
measurement slots to maximize the
number of samples in the desired
configuration. This may be velocity
along the four slanted beams, along
the vertical beam, or a combination
of the two. Burst mode can be
continuous or it can be set as a finite
number of samples at preset intervals
to save power and storage space.
Burst mode may include Altimeter and
Velocity data and it can co-exist with
Average data collection.
Altimeter data is applicable only for
the vertical beam. The term refers
to high-resolution measurement of
acoustic signal strength, much like a
professional echo sounder. This data
can be stored for analyses of sediment,
ice, biology, etc. and can also be used
to estimate the distance to the surface
or to the bottom. The altimeter data
can be interleaved with the velocity
data in Average Mode or in Burst
Mode, depending on the scientific
requirements applied to the data
collection plan.
Built on Advanced Technology
Measurement Modes
Simultaneously
or More Acoustic Frequencies
Processor Design, one for
broadband and one for
interface processing
or more tightly synchronized,
networked instruments
Inside the Nortek Signature series is
an entirely new platform. AD2CP was
built to increase flexibility and extend
instrument capabilities over the
coming decade. At the core, AD2CP is a
multi-function instrument, which may
include more transducers, multiple
acoustic frequencies, and several
measurement modes operating
simultaneously. AD2CP features proper
broadband processing, capable of
implementing different broadband
schemes. Signature Series AD2CPs
employ frequency based coding, more
easily defining appropriate transmit
Test Data
sequences. Today’s most advanced
electronics and smaller components,
make AD2CPs smaller, lighter,
and lower in power than previous
instruments. Smarter interfaces feature
both ASCII and binary serial interfaces,
Ethernet ports, and a Linux operating
system with TCP/IP protocol,
a Web server, and an FTP server. A
dramatically improved 20 Mbit rate
allows download of 1 GB of data in 6
minutes! Select features of the AD2CP
platform are protected by US patent
7,911,880.
Synchronization
Ideal for large arrays, multiple AD2CP instruments may be
connected over Ethernet providing tightly synchronized
datasets.
Ethernet 1
Ethernet 1
Ethernet 1
Ethernet 1
Wave measurements along the central axis of a Signature500 just
below the surface.
Nortek Ethernet Switch
Turbulence
Turbulence estimation with a typical ADCP is far from ideal
due to assumptions made during analysis, a single sampling
strategy, and indirect measurements of most quantities
of interest. Signature1000 and Signature500’s fifth beam
provides a direct measurement of one velocity component,
typically the vertical. This direct measurement allows easy
interpretation of along beam spatial gradients as well as by
cell time series analysis, eliminating the need to combine
beams to obtain orthogonal velocity components. High
sampling rates, flexible sampling strategies, and large velocity ranges make Signature1000 and Signature500 ideal for
turbulence studies from the surf zone to the open ocean.
T E C H N I C A L S P E C I F I C AT I O N S
Water Velocity Measurements
Power
Signature 500
Signature 1000
DC input:
Profiling Range*
50m
20m
Max. average consumption at 1Hz: 5 Watts. Peak current 1A. Ethernet adds 0.75 W
Cell Size
0.5 - 4m
0.2 - 2m
Typical average consumption:
See deployment software
Min. Blanking
0.5m
0.1m
Sleep Consumption:
100uA, power depends on supply voltage
Max # cells
128(burst)/200(average)
128(burst)/200(average)
Transmit power:
0.3–30W per beam, adjustable levels
Velocity Range (along beam)
User Selectable 1.0, 1.25, User Selectable 1.0, 1.25,
2.5, 3.75, 5.0 m/s
2.5, 3.75, 5.0 m/s
Ping sequence:
Parallel
Accuracy
1% of measured value
+- 0.5cm/s
1% of measured value
+- 0.5cm/s
Velocity Resolution
0.1 cm/s
0.1 cm/s
Max Sampling Rate Burst Only
6Hz
16Hz
Max Sampling Rate Five beams
Burst Only"
3Hz
8Hz
Max Burst Sampling rate
Combined burst and average
3Hz
8Hz
12–48VDC
Materials
Standard model:
Delrin® with titanium bolts.
Environmental
Operating temperature:
–4°C to 40°C
Storage temperature:
–20°C to 60°C
Shock and vibration:
IEC 721-3-2
Depth rating:
300 m
Internal Batteries
* maximum range depends on power consumption and acoustic scattering conditions
Type/capacity
100Wh Alkaline
Echo Intensity
New Battery Voltage
15 Volt
See deployment software
Sampling:
Same as velocity
Duration
Resolution:
0.5dB
Exact battery consumption and velocity uncertainty are complex functions of the
deployment configuration. Please consult the software for more exact predictions.
Dynamic range:
70dB
No. of beams:
5, 4 slanted at 25°, 1 vertical
Beam width:
2.9°
Altimeter option
Max altitude
Sensors
Thermistor embedded in head
–4°C to 40°C
Accuracy/Resolution:
0.1°C/0.01°C
Time response:
2 min
Compass:
Solid State Magnetometer
2 cm
38
Accuracy/Resolution:
0.2° for tilt <30°/0.01°
Maximum tilt:
Full 3D
Up or down:
Automatic detect
Pressure:
Piezoresistive
Standard Range:
0–100m (inquire for options)
Accuracy/Precision:
0.1% FS / Better than 0.002% of full scale
Data Communication
36
Solid State Accelerometer
118
31
2° for tilt <20°/0.01°
Tilt:
25° (4
x)
142
Accuracy/Resolution:
117
Ethernet or configurable RS-232/RS422
300–115200 baud
Recorder download baud rate:
20 Mbit/s (Ethernet only) - 1 GByte in 6 minutes
Controller Interface:
ASCII command interface with telemetry options
over Telnet and serial interface. Complete data
download over standard Ethernet FTP. Telemetry file
downloadable over serial interface. See interface
manual for more information.
Capacity (standard):
30°
Data Recording
16 GB / Optional 64 GB
86 bytes + 4 x Nbeams x Ncells
Mode:
Stop when full
6,
5
Data record:
(4
x)
118
Serial Communication Baud rate:
R6
5
I/O:
1MHz: 2m, 500kHz: 4m
Precision
184
Range:
1MHz: 30m, 500kHz: 100m
Min Altitude
220
Temperature:
Real Time Clock
Accuracy:
±1 min/year
Clock retention in absence of
external power:
1 year
Backup battery recharges automatically when the instrument is powered
Operating system:
Windows® 7 or later
Functions:
Deployment planning, start with alarm, data
retrieval, conversion to ASCII and Matlab format.
Online data:
Collection and graphical display.
TS-032-en-02.2014
Software
C U R R E NT A N D WAVE M E A S U R E M E NT S I N T H E O C E A N , L A KE A N D L A B O R ATO RY
Nortek AS
Vangkroken 2
1351 Rud, Norway
Tel: +47 6717 4500
Fax: +47 6713 6770
[email protected]
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67, Avenue Frédéric Joliot-Curie
BP 520, 83078 Toulon Cedex 09
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Fax: +33 (0) 4 94 31 25 49
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Bramshott Court
Bramshott
Hants
GU30 7RG, UK
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Mailbox 32, Boston,
MA 02210-2377
Tel: 617-206-5750
Fax: 617-275-8955
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