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CDJ middle & high frequency geophones, 4,10,15,28,30,40,60,80 or 100Hz, are widely used to seismic prospecting of petroleum, coal, metallurgy, national defense, engineering and etc.
SPECIFICATIONS
| CDJ-Z/P30 | CDJ-Z/P38 | CDJ-Z/P40 | CDJ-Z/P60 | CDJ-Z/P100 | |
Vertical/Horizontal | Vertil/Hori | Verti/Hori | Verti/Hori | Verti/Hori | |
| Nature Frequency Fn (Hz) | 30±5% | 38±5% | 40±5% | 60±5% | 100±5% |
| Sensitivity G (v/cm/s) | 0.28±5% | 0.26±5% | 0.26±5% | 0.30±5% | 0.25±5% |
| Coil Resistance Rc (Ω) | 500±5% | 650±5% | 690±5% | 1030±5% | 1080±5% |
| Resistance R (Ω) | 415±5% | 560±5% | 580±5% | 800±5% | 1020±5% |
| Damp Bt | 0.7±10% | 0.6±10% | 0.6±10% | 0.6±10% | 0.5±10% |
| Harmonic Distortion D (%) | ≤0.2 | ||||
| Insulation Resistance R (MΩ) | ≥20 | ||||
| Coil to Case Movement P-P (mm) | 2 | ||||
| Suspended Mass M (g) | 8.6 | 7.9 | 7.9 | 5.9 | 5.2 |
| Operating Temperature (°C) | -40~+70 | ||||
| Coil diameter (mm) | Ø27.2 | ||||
| Coil Height (mm) | 34 | 34 | 34 | 32 | 32 |
| Coil Weight (mm) | 86 | 86 | 86 | 78 | 78 |
| Case Length (mm) | 50 | ||||
| Case Width (mm) | Ø40 | ||||
| Case Height (mm) | 68(Vertical) / 62(Horizontal) | ||||
| Weight (g) | 255 | 247 | |||
30Hz-100Hz Geophone