LGT-20D Seismic Geophone

Type

LGT-20D4.5

LGT-20D10

LGT-20D14

LGT-20D28

Natural Frequency (Hz)

4.5 ± 0.5

10 ± 5%

14 ± 5%

28 ± 5%

Open Circuit Damping

0.6 ± 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 Sensitivity (V/cm/s)

0.288± 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

375 ± 5%

395 ± 5%

395 ± 5%

395 ± 5%

Close Circuit Resistance (Ω)

283 ± 5%

283 ± 5%

283 ± 5%

Harmonic Distortion 

≤0.6%

≤0.2%

≤0.2%

≤0.2%

Typical Spurious Frequency (Hz)

≥150

≥250

≥250

≥350

Moving Mass (g)

11.3

11

11

11

Coil Excursion P-P

4.0

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)

36

33.5

33.5

33.5

Core Unit Mass (g)

81

87

87

100

Operating Temperature(℃)

-40 to +90

-40 to +90

-40 to +90

-40 to +90

Warranty (year)

1

3

3

3

Type

LGT-20D40

LGT-20D60

LGT-20D100

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% (1500 Ω)

Intrinsic Voltage Sensitivity(V/cm/s)

0.42 ± 5%

0.39±5%

0.612 ± 5%

Sensitivity with Shunt Resistance (V/cm/s)

0.304 ± 5% (1500)

0.27±5% (2000)

0.32 ± 5% (1500 Ω)

Close Circuit Resistance (Ω)

Coil Resistance (Ω)

575 ± 5%

668±5%

808± 5%　

Distortion (%)

≤0.2

＜0.2

＜ 0.2

Typical Spurious Frequency (Hz)

≥400

 ≥550

≥ 600

Moving Mass (g)

8.2

6.5

7.6

Coil Excursion P-P (mm)

1.5

1.5

1.5

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

98

98

Operating Temperature(℃)

-40 to +90

-40 to +90

-40 to +90

Warranty(year)

3

2

2