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Force
Balanced Very Broadband Ocean Bottom Seismometer
Model
EP-300 OBS
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The EP300-OBS represents the new generation of low noise
very broadband ocean bottom seismometers for OBS applications.
The sensor's advanced force-balancing feedback provides for an extended
dynamic range, excellent stability and linearity across the entire
passband. This instrument uses three proprietary electrochemical transducers
with identical responses mounted orthogonally along the N, E, and
Z-axes. These transducers have many advantages over traditional electromechanical
sensors. In particular, they have much larger ground motion-to-voltage
conversion ratio that results in a uniquely shaped noise curve that
is essentially flat from several Hertz to the longest periods.
Like our other seismometers, the EP300-OBS is extremely rugged
which makes it ideal for OBS use. This seismometer does not require
a mass lock, mass centering, or special installation equipment or
procedures. It has very low power consumption, operates over a wide
temperature range; and stays operational within a wide range of
installation tilts (optional inclinometer to measure installation
tilt). It provides low cost of ownership, requiring no maintenance
over the life of the instrument. Options include internal inclinometers.
Three and five-year extended warranties are available.
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FEATURES
- Passband 0.0167 Hz to 50 Hz, Optional 0.01 Hz and
0.008 Hz
- Low Power
- No Mass Centering or Mass Locks
- High Sensitivity
- 150dB Dynamic Range
- Rugged
- Maintenance Free
- Operates over a wide tilt
- Flat Frequency Response
- Force Balanced
- Calibration Inputs
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SPECIFICATIONS |
GENERAL |
Operating principle: |
Electrochemical motion transducer
with force-balancing feedback |
Output signals: |
2 horizontal, 1 vertical;
very broad passband, velocity flat response |
Output signal swing: |
±7.5 V (±15 V p-p) |
Dynamic Range: |
150 dB @ 1Hz |
Bandwidth: |
Standard: 0.0167 -
50 Hz; Optional.: 0.01 - 50 Hz |
Self-noise: |
Below USGS NLNM in
0.05 - 5Hz range; -170dB @ 0.033Hz. |
Generator constant: |
Standard: 2000 V/m/s; Opt.: 350
- 20,000 V/m/s |
Calibration input |
1kohm; 1V in - 1V out; individual
for each channel |
Mass Lock |
NONE REQUIRED |
Mass Centering: |
NONE REQUIRED |
Maximum installation tilt |
±10° |
Mechanical resonance |
>150 Hz |
ENVIRONMENTAL |
Case |
Customized to application |
Temperature range: |
Standard: -12 to +
55 °C
Others optional |
HOW
TO ORDER |
MECHANICAL |
Basic EP-300-OBS Configuration |
The standard configuration
includes mating connector and calibration sheets |
Extended Period |
option -01Hz or -008Hz
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Sensitivity Option |
option -Sxxxxx
(x specifies sensitivity) |
Full Scale Output (+/-15V) Option |
option -FS15 |
Recorder Options |
DAS-6502
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Supplies and Accessories |
Sensor Cable |
General Spares |
None |
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S Printer
Friendly Format For Specifications
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Case diameter |
Customized to application |
Case height: |
Customized to application |
Weight |
Customized to application |
Connector |
Customized to application |
POWER |
Power - Standard |
10 - 15 Vdc; 12 Vdc nominal |
Supply current |
10mA |
NOISE CURVE |
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Specifications Subject
to Change Without Notice |
©eentec 2000, 2003 |
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