Low and Medium Frequency Geophone Specifications

Type

LGT-4.5

LGT-10

LGT-14

LGT-28

Natural Frequency (Hz)

4.5±10%

10 ± 5%

14 ± 5%

28 ± 5%

Open Circuit Damping

0.6 ±10%

0.271 ± 5%

0.2 ± 5%

0.6 ± 5%

Damping with Shunt Resistance

0.6 ± 5%

0.6 ± 5%

Intrinsic Voltage Senditivity (V/cm/s)

0.288 ± 10％

0.288 ± 5％

0.288 ± 5％

0.31 ± 5％

Sensitivity with Shunt Resistance (V/cm/s)

0.227 ± 5％

0.182 ± 5％

Coil Resistance

375 ± 5％

375 ± 5％

375 ± 5％

385 ± 5％

Close Circuit Resistance (Ω)

296 ± 5％

236.5 ± 5％

Harmonic Distortion 

≤0.3%

≤0.2%

≤0.2%

≤0.2%

Typical Spurious Frequency (Hz)

≥180

≥200

≥250

≥400

Moving Mass (g)

11.3

11.3

11.6

10.2

Coil Excursion P-P

4

2

2

1.6

Maintains Fn Specifications to Tilt Angle 

≤10

≤20

≤20

90

Core Unit Diameter (mm)

25.4

25.4

25.4

26

Core Unit Height (mm)

36

32

32

32

Core Unit Mass (g)

74

74

74

95

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-35

LGT-60

LGT-100

Natural Frequency (Hz)

35 ± 5%

60±5%

100±5%

Open Circuit Damping

0.6 ± 5%

0.503±5%

—

Damping with Shunt Resistance

0.60±5%

0.63±5%

Intrinsic Voltage Senditivity (V/cm/s)

0.325± 5％

0.351±5%

—

Sensitivity with Shunt Resistance (V/cm/s)

0.27±5%

0.25±5%

Coil Resistance

560± 5％

2000± 5％

1100± 5％

Close Circuit Resistance (Ω)

600±5%

820±5%

Harmonic Distortion 

≤0.2%

＜0.2

＜0.2

Typical Spurious Frequency (Hz)

≥500

 ≥550

 ≥600

Moving Mass (g)

9.3

6.5±5%

7.6±5%

Coil Excursion P-P

1.8

1.5

1

Maintains Fn Specifications to Tilt Angle 

90

90°

90°

Core Unit Diameter (mm)

26

27

27

Core Unit Height (mm)

32

33.5

33.5

Core Unit Mass (g)

95

95

95

Operating Temperature(℃)

-40 to +90

-40 to +90

-40 to +90

Warranty (year)

3

2

2