SUMMIT COMPACT 24 CHANNEL SEISMOGRAPH

NEW SPECIAL PACKAGE PRICES

24 CHANNEL DISTRIBUTED SEISMOGRAPH UNIT 24 BIT RESOLUTION - VERY FAST SAMPLING RATES USE MULTIPLE UNITS OR MIX WITH SUMMIT TWO CHANNEL UNITS FOR UP TO 1200 ACTIVE CHANNELS CONTROL THE WHOLE SYSTEM FROM A NOTEBOOK COMPUTER WITH A USB PORT IDEAL FOR HIGH RESOLUTION TOMOGRAPHY, VSP, AND HIGH RESOLUTION REFLECTION AND REFRACTION SURVEYS. VERY WIDE TEMPERATURE RANGE: -30 C TO +80 C, 0 TO 100% HUMIDITY ISO9001 CERTIFIED MANUFACTURER, CE MARK.

GISCO is proud to introduce the DMT 24 bit SUMMIT Compact Unit (SCU) for seismic exploration. Likely seismic techniques include very high resolution tomography, vertical seismic profiling, shallow reflection/refraction and deep seismic sounding for various applications, such as engineering seismology and environmental surveys. For Vibroseis application the correlation with diversity stacking is performed within the SCU. One SCU handles 12 or 24 seismic input channels. Up to 1200 channels (50 SCUs) can be linked to a central control PC via a simple two wire cable. By using repeaters each 330 m the maximum cable length is unlimited. The SCUs can be linked to the transmission cable at any position. SCUs and SUMMIT 2 channel Remote Units can be combined on the same line. Each channel consists of a preamplifier, an analog High-Cut Filter, an A/D-Converter and a high performance 24 bit Digital Signal Processor. This circuit allows high speed data conversion, digital filtering and has a dynamic range of more than 120 dB. The data are sampled with high frequency and reduced to the desired sample frequency using over-sampling technique, with improves system resolution. The control PC provides QC functions, data acquisition software, as well as plot facilities and final data storage on various PC controlled devices (disc, 9track, DAT, etc.) in standard SEG format. Built in test functions include: sine test, pulse, instrument noise, geophone step, sweep transfer, autocorrelation, battery status, distortion, dynamic range, common mode rejection, cross talk, timming accuracy, geophone impedance, damping, leakage, natural frequency, and noise..

Screen image of new Windows NT control software for Summit and Compact

Specifications: Number of Channels per Unit: ...... 12 or 24 Maximum Number of Channels: ... 1200 Sample Interval: ........................... 1/32, 1/16, ..., 8 ms Number of Samples per Trace: ..... 512, 1K, 2K,.. 16K in vib mode, 48k dynamite mode Maximum Input Signal: ................. 2 Vrms System Input Noise: ....................... 0.3 uvrms @ 2 ms sample rate Dynamic Range: ............................ 120 dB @ 2 ms System Resolution: ........................ 24 bits @ 2 ms Preamplification: ........................... 0 or 18db Gain Accuracy between Channels: .better than 1 % Input Impedance: ........................... 20K ohms Common Mode Rejection Ratio: ... > 100 dB Total Harmonic Distortion: ............ <0.0008 % Low Cut filter analog: .................... 1Hz @6db/octive Alias filter analog: ......................... 7.2kHz @6 dB/oct Alias Filter digital: ......................... -120 dB rejection at Nyquist freq. ....................................................... Passband ripple <+/- 0.5db ....................................................... -6db 12.8kHz @ 1/32 ms sample rate down to ....................................................... 50Hz @ 8ms sample rate Crosstalk: ...................................... > 114 dB Data Format: ................................. 24 bit fixed point Weight: ......................................... 7.5 kg Dimensions: .................................. 1 9 x 19 x 35 cm Power Supply: .............................. +12 VDC @ 0.4 W/channel Operation Temperature Range: .....-30 C to +80 C, 0 - 100% humidity Typical shot cycle time: ................ 10 seconds for 2k samples, 1ms sample rate, ...................................................... 256 channels, including data storage