Ultra Low Noise
Force Balanced Accelerometer
Model EA-140






The EA-140 occupies the high-end range of the Servo Force Balance Accelerometer line. It offers very low noise, high dynamic range, in a frequency band of DC to 50 Hz. It is suited for specialized strong motion monitoring applications.

The EA-140 standard packaging is an open-ended 3 1/4 inch plate that can be mounted internally in the SMR recorder or the R-1 Triaxial Rotational Sensor. Optional freestanding field or borehole packages are available.

The sensor elements are housed in an epoxy sealed aluminum case. They are extremely rugged, and designed for long-term deployment in field environments. Unlike solid-state type accelerometers, the EA-140 does not experience significant drifting with temperature changes.

Options include a variety of full-scale "g" levels, user selectable full-scale "g" ranges, and other frequency bands

FEATURES
  • Very Low Noise
  • Wide Temperature Range
  • Low Power
  • Rugged
  • Optional Full Scale g levels
  • Optional Passbands
  • Borehole Configurations
  • 148dB Dynamic Range
  • Maintenance Free
SPECIFICATIONS
GENERAL
Operating principle: Force balanced servo accelerometer
Full Scale
Optional 		±2 g standard
±0.5 g to ±5 g, user selectable
Dynamic Range 142 dB ± 5V
148 dB ± 10V
Frequency
Optional 		DC to 50 Hz +1, -3 dB
DC to 100 Hz or 200 Hz
(damping 70% critical)
Output Signal Swing 0.5 to 4.5 V or ±2.5V, ±5 V,
or ± 10 V
Resolution (at ±10 V) 0.1 µg @ 1g
0.2 µg @ 2g
Zero G bias ± 0.01g, optional electronic adjustment
Linearity ± 0.2% FS over temperature range (0.1% opt)
Cross Axis Sensitivity 0.02 g/g (0.005 g/g option)
HOW TO ORDER
BasicEA-140 Configuration The standard configuration includes flying leads and calibration sheets
Extended g range

option -xg
(x specifies g)
Frequency Option option -Fxxx
(x specifies frequency)
Electronic Zero Bias option -ZB
Linearity (0.1%) option -L01
Crossaxis (0.005 g/g) option -CA5
Supply Voltage option -PWxx
(x specify voltage)
Full Scale Output Volt specify
Packaging specify
Recorder Options SMR-4000
SMR-6102
Supplies and Accessories Sensor Cable
General Spares None

S Printer Friendly Format For Specifications

 ENVIRONMENTAL
Waterproof: Optional field case
Operation Temperature -10° to 75° C (opt SS +85° C)
Vibration Survival 10 g RMS, 2 to 2,000 Hz
Shock Survival 1000 g, 1 ms 100 g, 11 ms
Humidity 95% R.H. (opt. SS 100%R.H.)
MECHANICAL
Housing Standard
Optional 		Open Internal Mount 3.25" plate appx. Field Enclosure, SS (stainless steel), Borehole
Sensor Element: 1.25"H x 1"Diam
Weight (Al housing) Package dependent
Connector Package defendant
POWER
Power - Standard ± 12V typ. others optional
Supply current 30 ma (triaxial)
NOISE CURVE

 


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