Applications and Features

• 1~3Hz geophones applied for deep seismic prospecting, natural earthquake surveillance and prediction, pulse and microseismic measurement for bridge and highways, etc.

• 4~100 Hz widely used to seismic prospecting of petroleum, coal, metallurgy, defense engineering and etc.

• High sensitivity, low-distortion, reasonable damping coefficient, good linear response, good parameter conformity, higher resolution and excellent waterproof property.

• Small-sized, easy to install, easy to operate, large ambient temperature range, can meet the demand of multi-wave component seismic data acquisition technology

Technical Specifications ((20℃)

Table 1

Medium–High Frequency (vertical and horizontal) Geophones Parameter\type name CDJ-Z/P4 CDJZ/P4.5 CDJ-Z/P10 CDJ-Z/P15 CDJ—Z/P28 CDJ-Z/P30 CDJ—Z/P38 Natural Frequency (Hz) 4±10% 4.5±10% 10±5% 15±5% 28±5% 30±5% 38±5% Sensitivity G  (v/cm.s-1) 0.28±5% 0.26±5% Coil Resistance Rc(Ω) 365±5% 365±5% 365±5% 500±5% 500±5% 650±5% Internal Resistance (Ω) 345±5% 335±5% 310±5% 415±5% 415±5% 560±5% Damping Coefficient Bt 0.7±10% 0.58±10% 0.58±10% 0.62±10% 0.6±10% 0.6±10% Harmonic Distortion D ≤ 0.2 Insulating Resistance  Ri (MΩ) ≥ 20 Coil'S Maximum Displacement P-P(mm) 2 Suspension Mass( g ) 13.2 12.8 8.6 7.9 Working Temperature (℃) — 40 ～ ＋ 70 Weight ( g ) 255

Table 2 Medium–High Frequency (vertical and horizontal) Geophones Parameter\type name CDJ-Z/P40  CDJ-Z/P60  CDJ—Z/P80 CDJ—Z/P100 Natural Frequency (Hz) 40±5% 60±5% 80±5% 100±5% Sensitivity G  (v/cm.s-1) 0.26 ±5% 0.3 ±5% 0.25 ±5% 0.25 ±5% Coil Resistance Rc(Ω) 690±5% 1030 ±5% 735 ±5% 1080 ±5% Internal Resistance (Ω) 580 ±5% 800 ±5% 685 ±5% 1020 ±5% Damping Coefficient Bt 0.6 ±10% 0.6 ±10% 0.55 ±10% 0.5 ±10% Harmonic Distortion D ≤ 0.2 Insulating Resistance  Ri (MΩ) ≥ 20 　 Coil'S Maximum Displacement P-P(mm) 2 Suspension Mass( g ) 7.9 5.9 5.5 5.2 Working Temperature (℃) — 40 ～ ＋ 70 Weight ( g ) 255

Table 3 Low-Frequency (vertical, horizontal and three-component ) Geophones Parameter\type name CDJ-Z1/P1/S1  CDJ-Z1A/P1A/S1A Natural Frequency (Hz)  1±10% Coil Resistance Rc(Ω)  3400±10% 3500±10% Open Circuit Sensitivity G (v/cm/s) 2±10% 6.7±10% Closed Circuit Sensitivity (v/cm/s) 1.83±10% 6.4±10% Internal Resistance R(Ω) 3100±10% 3300±10% Open Circuit Damping Coefficient Bt 0.32±10% Closed Circuit amping Coefficient 0.43±10%  Insulating Resistance  Ri (MΩ) ≥ 10 Coil'S Maximum Displacement P-P (mm) 6 Suspension Mass ( g ) 770 Working Temperature (℃) —25 ～ ＋55 Weight (K g ) 8.15 3.4 10 8.15 3.4 10

Table 4 Low-Frequency (vertical, horizontal and three-component ) Geophones Parameter\type name CDJ—Z2A/P2A/S2A CDJ-Z2B/P2B/S2B CDJ-Z2C/P2C/S2S Natural Frequency (Hz) 2±10% Sensitivity G  (v/cm.s-1) 1.2±10% 3.5±10%% 2±10% Coil Resistance Rc(Ω) 1600±5% 13000±5% 6040±5% Internal Resistance (Ω) 1540±5% 12800±5% 5800±5% Damping Coefficient Bt 0.7±10% Harmonic Distortion D ≤ 0.2 Insulating Resistance  Ri (MΩ) ≥ 20 Coil'S Maximum Displacement P-P(mm) 3 Suspension Mass( g ) 60 Working Temperature (℃) —25 ～ ＋55 Geophone Element Weight (K g ) 0.25 Table 5 Low-Frequency (vertical, horizontal and three-component ) Geophones Parameter\type name CDJ—Z2.5A/P2.5A/S2.5A CDJ-Z2.5B/P2.5B/S2.5C CDJ-Z2.5C/P2.5C/S2.5S Natural Frequency (Hz) 2.5±10% Sensitivity G  (v/cm.s-1) 1.2±10% 3.5±10% 2±10% Coil Resistance Rc(Ω) 1600±5% 13000±5% 6040±5% Internal Resistance (Ω) 1540±5% 12800±5% 5650±5% Damping Coefficient Bt 0.7±10% Harmonic Distortion D ≤ 0.2 Insulating Resistance  Ri (MΩ) ≥ 20 Coil'S Maximum Displacement P-P(mm) 3 Suspension Mass( g ) 60 Working Temperature (℃) —25 ～ ＋55 Geophone Element Weight (K g ) 0.25 Table 6 Low-Frequency (vertical, horizontal and three-component ) Geophones Parameter\type name CDJ—Z3A/P3A/S3A CDJ-Z3B/P3B/S3B CDJ-Z3C/P3C/S3S Natural Frequency (Hz) 3±10% Sensitivity G  (v/cm.s-1) 1.2±10% 3.5±10% 3±10% Coil Resistance Rc(Ω) 1600±5% 13000±5% 6040±5% Internal Resistance (Ω) 1540±5% 12800±5% 5650±5% Damping Coefficient Bt 0.7±10% Harmonic Distortion D ≤ 0.2 Insulating Resistance  Ri (MΩ) ≥ 20 Coil'S Maximum Displacement P-P(mm) 3 Suspension Mass( g ) 60 Working Temperature (℃) —25 ～ ＋55 Geophone Element Weight (K g ) 0.25