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LGT-20D Seismic Geophone
LGT-20D Seismic Geophone
  Instruction

LGT-20D seismic Geophone is compatible with all field data acquisition systems. All operating parameters are confirmed with a proprietary computerized test system during the manufacturing process. This can help the customers to carry on the geological explore in any corner in the world and obtain the detail and correct geological data.

  Specifications

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Low and Medium Frequency Geophone Specifications
Type LGT-20D4.5 LGT-20D10 LGT-20D14 LGT-20D28
Natural Frequency (Hz) 4.5 ± 0.5Hz 10 ± 5% 14 ± 5% 28 ± 5%
Open Circuit Damping 0.7 ± 5% 0.3 ± 5% 0.22 ± 5% 0.27 ± 5%
Damping with Shunt Resistance   0.7 ± 5% 0.51 ± 5% 0.552 ± 5%
Intrinsic Voltage Senditivity (V/cm/s) 0.234 ± 5% 0.28 ± 5% 0.28 ± 5% 0.39 ± 5%
Sensitivity with Shunt Resistance (V/cm/s)   0.2 ± 5% 0.2 ± 5% 0.28 ± 5%
Coil Resistance 395 ± 5% 395 ± 5% 395 ± 5% 395 ± 5%
Close Circuit Resistance (Ω)   283 ± 5% 283 ± 5% 283 ± 5%
Harmonic Distortion  0.3% 0.2% 0.2% 0.2%
Typical Spurious Frequency (Hz) 180 250 300 400
Moving Mass (g) 11.3 11 11 11
Coil Excursion P-P 1.5 1.5 1.5 1.5
Maintains Fn Specifications to Tilt Angle  10 20 20 90
Core Unit Diameter (mm) 25.4 25.4 25.4 27
Core Unit Height (mm) 33.5 33.5 33.5 33.5
Core Unit Mass (g) 87 87 87 100
Operating Temperature(℃) -40 to +90 -40 to +90 -40 to +90 -40 to +90
Warranty (year) 1 3 3 3
         
High Frequency Geophone Specifications  
Type LGT-20D40 20DX60 20DX100  
Natural Frequency(Hz) 40 ± 5% 60±5% 100 ± 5%  
Open Circuit Damping 0.37 ± 5% 0.503±5% 0.464 ± 5%  
Damping with Shunt Resistance 0.576 ± 5% 0.60±5% 0.65 ± 5% (1000 Ω)  
Intrinsic Voltage Sensitivity(V/cm·s-1) 0.42 ± 5% 0.351±5% 0.612 ± 5%  
Sensitivity with Shunt Resistance (V/cm·s-1)

0.304 ± 5%
(1500)

0.27±5%
(2000)
0.32 ± 5% (11000 Ω)  
Close Circuit Resistance (Ω)        
Coil Resistance (Ω) 575 ± 5% 600±5% 1004± 5%   
Distortion(%) 0.2% <0.2 < 0.2%  
Typical Spurious Frequency (Hz) 400  ≥550 ≥ 600  
Moving Mass (g) 8.2 6.5±5% 7.6±5%  
Coil Excursion P-P 1.5 1.5 1.5mm  
Maintains Fn Specifications to Tilt Angle  90 90° 90°  
Core Unit Diameter (mm) 27 27 27  
Core Unit Height (mm) 33.5 33.5 33.5  
Core Unit Mass (g) 100 95 95  
Operating Temperature(℃) -40 to +90 -40 to +90 -40 to +90  
Warranty(year) 3 2 2  

Frequency Response Curves
  
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