Force Balanced Very Broadband Seismometer
Model EP-300






The EP300 represents the new generation of low noise very broadband seismometers equally suitable for stationary, field and OBS (reduced power version) 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 is extremely rugged which makes it ideal for field use. This seismometer does not require a mass lock, mass centering, or special installation equipment or procedures. It has low power consumption, operates over a wide temperature range; is waterproof up to the one-meter depths, and stays operational within a wide range of installation tilts. It provides low cost of ownership, requiring no maintenance over the life of the instrument. Options include a (5-inch diameter) borehole package, with internal inclinometers. Three and five-year extended warranties are available.


FEATURES
  • Passband 0.0167 Hz to 50 Hz, Optional 0.01 Hz and 0.0083 Hz
  • Low Power
  • No Mass Centering or Mass Locks
  • High Sensitivity
  • 150dB Dynamic Range
  • Rugged
  • Maintenance Free
  • Waterproof
  • Operates over a wide tilt
  • Flat Frequency Response
  • Force Balanced
  • OBS and Borehole Configurations
  • Calibration Inputs
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: 10 V (20 V p-p)
Dynamic Range: 150 dB @ 1Hz
Bandwidth: Standard: 0.0167 - 50 Hz; Optional.: 0.01, 0.0083- 50 Hz
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
Waterproof: Submersible (1m)
Temperature range: Standard: -12 to + 55 C
Others optional
HOW TO ORDER MECHANICAL
BasicEP-300 Configuration The standard configuration includes mating connector and calibration sheets
Extended Period

option -01Hz or -0083Hz

Sensitivity Option option -Sxxxxx
(x specifies sensitivity)
Case Option Specify
Recorder Options DR-4000,
DAS-6102
Supplies and Accessories Sensor Cable
General Spares None
   

S Printer Friendly Format For Specifications

Case diameter 200 mm
Case height: 245 mm
Weight (Aluminum housing) 9.5 kg
Connector 14-pin circular
POWER
Power - Standard 10 - 15 Vdc; 12 Vdc nominal
Supply current Standard: 30 mA; LP version: 10mA
NOISE CURVE

 


 


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