Applications Shallow reflected or shallow refracted wave surveying, transient rayleigh wave surveying, wave speed testing, ground s the world's smallest engineering seismic surveying equipment at present. 3. Built-in scrolling switch for ease of covering multiple reflected wave surveys 4. Contains all shallow seismic surveying functionality 5. Windows 2000 operating system 6. Chinese user interface 7. Water-tight keyboard and mouse buttons 8. Two usb ports 9. Signal edge trigger, ttl trigger synchronization Main specifications: Channel no: 24 Sampling interval: 25 us- 10 ms (selectable) Bandwidth: 0.1 hz - 5000 hz Programmable analog filter Low cut filter: 10-200 hz programmable High cut filter: 500-2000 hz programmable Band cut filter: 50/60 hz A/d (ifp's) precision: δ σ 24 bit Computational precision: 32 bit Equivalent noise: 1μ v, rfi (at 2.0ms sampling rate) Cross-channel interference: > 80db Harmonic distortion: -114 db (at 2.0ms sampling rate) Data display and recording: Main processor: intel pentium 500 mhz processor Memory: 118 mb Internal hard drive: 10 gb Monitor: 1024 x 512 8" svga Data transfer: usb Data storage: seg2, segy, and geopen data format System self-test criteria Static voice sound, cross-channel consistency, cross-channel isolation Main unit size and weight Size: 330x180x100mm, weight: 4.5 kg Environmental tolerances: Operating temperature: -20 to 50 deg c Storage temperature: -40 to 70 deg c Operating humidity: 0 - 95% Protecting packing