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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/P4 | CDJ-Z/P4.5 | CDJ-Z/P10 | CDJ-Z/P15 | CDJ-Z/P28 | |
Vertical/Horizontal | Verti/Hori | Verti/Hori | Verti/Hori | Verti/Hori | |
| Nature Frequency Fn (Hz) | 4±10% | 4.5±10% | 10±5% | 15±5% | 28±5% |
| Sensitivity G (v/cm/s) | 0.28±5% | ||||
| Coil Resistance Rc (Ω) | 365±5% | 365±5% | 365±5% | 365±5% | 500±5% |
| Resistance R (Ω) | 345±5% | 345±5% | 335±5% | 310±5% | 415±5% |
| Damp Bt | 0.7±10% | 0.7±10% | 0.58±10% | 0.58±10% | 0.62±10% |
| Harmonic Distortion D (%) | ≤0.2 | ||||
| Insulation Resistance R (MΩ) | ≥20 | ||||
| Coil to Case Movement P-P (mm) | 2 | ||||
| Suspended Mass M (g) | 13.2 | 13.2 | 12.8 | 12.8 | 8.6 |
| Operating Temperature (°C) | -40~+70 | ||||
| Coil diameter (mm) | Ø27.2 | ||||
| Coil Height (mm) | 34 | ||||
| Coil Weight (mm) | 85 | 85 | 85 | 85 | 86 |
| Case Length (mm) | 50 | ||||
| Case Width (mm) | Ø40 | ||||
| Case Height (mm) | 68(Vertical) / 62(Horizontal) | ||||
| Weight (g) | 255 | ||||
4Hz-28Hz Geophone