The RAS-24 is a modular 24-channel, high resolution, signal enhancement seismograph designed for shallow refraction and reflection surveys, and general geophysical exploration. Based on a "distributed" approach, like larger seismic systems used for oil and gas surveys, the RAS-24 is the first refraction/reflection seismograph to combine state-of-the-art 24-bit conversion with a flexible, expandable architecture that provides the ease of use of a conventional system with the advantages of a distributed system.
Available with 12 or 24 channels
24-Bit Delta-Sigma A/D conversion
Wide dynamic range (117db @ 2ms)
Connect up to 5 boxes (120 channels)
3D on up to 5 lines
Automated system performance tests
Signal enhancement for noise reduction
Intuitive operation under Windows XP/Vista
Operates with any laptop
Lightweight - 10 lb
Uses standard 12-channel spread cables
Number of Channels: 12 or 24 per RAS module, up to 120 channels per system (5 modules)
Sample Intervals: .125, .25, .5, 1, 2 and 4 ms
Record Length: 4 ms - 64 sec, 2 ms - 32 sec, 1 ms - 16 sec,
.5 ms - 8 sec,.25 ms - 4 sec, .125 ms - 2 sec
Multiline Operation: 10 lines
CDP Operation: 2D: Automatic or manual roll of entire spread
3D: Managed by RAS-24 script editor
Stacking: Vertical stack
Cable: One 12 takeout cable for 12-channel system. Two for 24 channel system
Laptop to RAS Interval: 1200ft maximum 3 pair wire
RAS to RAS Interval: 5000ft maximum 2 pair wire
Recording Format: SEG-2, SEG-D 8038, SEG-D 8058
Oil & gas exploration
Mineral exploration
Geotechnical surveys
Engineering geology
Groundwater surveys
VSP and tomography
Depth-to-rock
Fault location
Site remediation
Surface wave analysis
Rippability surveys
Teaching and research
Channels: 12 or 24
A/D Resolution: 24 bits using Delta-Sigma A/D converters - one per channel
Preamp Gain (PG): 12db, 24db, 36db or 48db, remotely selectable
Frequency Response: .125 ms: 2 - 3300Hz, .25 ms: 2 - 1650 Hz, .5 ms: 2 - 825 Hz,
1 ms: 2 - 412 Hz, 2 ms: 2 - 206 Hz, 4 ms: 2 - 103 Hz
Dynamic Range: 112db @ 2 ms PG=36db, 117db @ 2 ms PG=12db (typ)
Distortion (THD): .005% at 25 Hz, 2 ms sample interval (typ)
Crosstalk: Greater than 90db
CMR: Greater than 90db @ 60 Hz
Max Input Signal: 880 mVRMS @ 12db, 55 mVRMS @ 36db
Input Noise: .21 mVRMS @ 2ms PG=36db, 1.6 mVRMS @ 2ms PG=12db (typ)
Anti-Alias Filters: 4 ms 103 Hz, 2 ms 206 Hz, 1 ms 412 Hz, .5 ms 825 Hz,
.25ms 1650 Hz, .125ms 3300 Hz
Test Oscillator: 10, 25, 50, 60, 100, 125, 200, 250 Hz
Amplitude adjustable in 10 mV steps
Instrument Tests: Internal digital tests, battery voltage, internal voltage, crosstalk,
amplifier pulse, CMR, amplifier noise, dynamic range, gain &
phase similarity, system timing, communications, trigger verification
Line Tests: Geophone pulse, geophone similarity, geophone resistance, cable leakage
Connectors: Two 27-pin NK-27-21C connectors for geophone spread cable,
3-pin Bendix for trigger, two 6-pin Bendix for data,
3-pin Cannon for power
Power: 12 volts nominal.
Standby: 60ma / Acquisition:12 Chs: 1A, 24 Chs: 2A
Physical: 10.5” x 13.5” x 6”, 10 lb
Operating Temp: -30 to 70°C
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