Benefits - Nanometrics

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Benefits - Nanometrics
The highly successfulTrillium 120 is now
available with motorized mass centering.
This new version maintains exceptional performance over a
wide temperature range with the added benefit of fast “onetouch” mass centering. Motorized mass centering simplifies
seismometer installation and gives customers the option of
remotely re-centering the masses via a telemetry connection.
The Trillium 120PA is an exceptional seismometer having an
instrument self noise within 4 dB of the NLNM at 100
seconds and below the NLNM up to 10 Hz.
This instrument incorporates the same symmetric triaxial
design and suspension system as the highly successful
Trillium 240. The robustness and reliability of the mechanical
suspension is well-proven; with over 1000 Trillium units operating in the field, there have been no mechanical failures.
Benefits
➤ Motorized mass centering for rapid deployment in harsh
environments
➤ Very broadband performance from a portable low power
seismometer
➤ Simple operation with no mass lock to forget
➤ Wide temperature operation +/-45ºC without re-centering
➤ Switchable XYZ/UVW output to provide independent
calibration of sensor axis
TRILLIUM 120PA
Technical Specifications
Self Noise Performance Plots
-130
Specifications subject to change without notice.
-140
TECHNOLOGY
Topology
Feedback
Mass centering
NM
-150
NLN
M
ML
PSD (dB wrt 1m^2/s^4/Hz)
-120
-160
Leveling
Alignment
-170
Trillium 40
-180
-190
-200
PERFORMANCE
Self noise
Sensitivity
Trillium 120PA
Trillium 240
1000
Period(seconds)
100
10
1
0.1
I N T E R FA C E
Connector
Velocity output
Seismometers self noise plotted against NLNM (after Peterson, 1993)
and MLNM (after McNamara and Buland, 2004)
-25
Mass position
Calibration input
The Earthquake Spectrum
Serial port
Trillium 120PA Full Scale
-50
.5
M5
-75
8.0
.5
M1
-125
M
6.0
-150
M
LN
M 3.5
M 1.5
P H YS I C A L
Diameter
Height
Weight
Handling
M
NM
M
Supply voltage
Power consumption
Protection
M 5.5
.5
M3
-100
P OW E R
M 7+
NL
Peak Velocity in Octave Bandwidth (dB wrt 1m2/s2)
0
Trillium
40
Trillium
120PA
Trillium
240
-175
-200
E N V I R O N M E N TA L
Operating temp
Humidity
Shock
-225
-250
Bandwidth
Clip level
Temperature
Packaging
10-4
10-3
10-2
10-1
100
Frequency (Hz) After Clinton & Heaton (Seis.Res.Let.73.3.2002)
101
Symmetric triaxial
Force balance with capacitive transducer
Automatic motorized re-centering, can be remotely initiated
Integrated bubble level; Adjustable locking leveling feet
Vertical scribe marks for (N and S); Precision guide in
cover for straight-edge, line or laser level; Holes for 5/16”
alignment (E and W)
Below NLNM 35 s to 10 Hz (See graph)
1200 V-s/m nominal +/- 0.5% precision
Contact factory for other options
-3 dB points at 120 s and 175 Hz
>15 mm/s up to 1.5 Hz
+/- 45ºC without motorized re-centering
19-pin MIL-C-28642
40 V peak-to-peak differential
Selectable XYZ or UVW mode
Three independent voltage outputs
Single voltage input with one active-high control signal per
channel; Calibration with XYZ or UVW
For enhanced instrument control and status:
• Mass center, UVW/XYZ mode, short/long period
mode, firmware updates
• Temperature, mass position, instrument status, serial
number
9 to 36 volts DC isolated inputs
620 mW typical at 15 volts
Reverse voltage protection
Auto-resettable over-current protection (no fuse)
21.0 cm
21.4 cm +/- 0.5 cm depending on leveling feet extension
7.5 Kg
Detachable carrying handle on lid
-20 to +50 C
0 to 100%
20 g half sine, 5 ms without damage, 6 axis; No mass lock
required for transport
Rated to IP68 and NEMA6P for outdoor use
102
Earthquake Categories
Local events <~10km
Several seconds to 30Hz
Regional
>~10km
30 seconds to 10Hz
Teleseismic >~3000km 3600 seconds to 2 seconds
Note: Sensor noise floors and earth noise models have been converted to equivalent peak amplitudes using a full octave bandwidth assuming Gaussian distribution and 95% probability.
References
New Low-Noise Model (NLNM) from Peterson (1993), Observation and Modeling of Seismic Background Noise
PDF Mode Low-Noise Model (MLNM) from McNamara and Buland (2004), Ambient Noise Levels in the Continental United States
Event Magnitudes from Clinton and Heaton (2002), Potential Advantages of a Strong Motion Velocity Meter Over a Strong Motion Accelerometer
250 Herzberg Road, Kanata, Ontario, Canada K2K 2A1
613-592-6776 Fax: 613-592-5929 www.nanometrics.ca
Email: [email protected]

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