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RAS-72, 96,120
Specifications
| GENERAL |
| Number of Channels:
|
72, 96
or 120 Channels per module |
| 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: |
Typically existing CDP cables are used with the RAS-120 |
| Recording Format: |
SEG-2, SEG-D 8038, SEG-D 8058 |
| RAS-72,96 120
MODULE |
| Channels: |
72, 96 or 120 |
| 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: |
Connectors for geophone spread cable are user specified
3-pin Bendix for trigger, two 6-pin Bendix for data,
3-pin Cannon for power |
| Power: |
12 volts
nominal. Current: 120 Chs: 7.5A, 96 Chs: 6A, 72 Chs: 3A |
| Physical: |
23” x 22.5” x 10”, 42 lbs |
| Operating
Temp: |
-30 to
70°C |
Seistronix reserves the right to change specifications
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EX-12 Seismograph
Seistronix introduces the EX-12 exploration seismograph. The EX-12
is a distributed system based on the technology used in the EX-6. With 12
channels per box, the EX-12 reduces the the number of boxes, cables and
batteries by half. Read
more here
Continuous Recording
The EX-6 now supports continuous real-time recording
for applications such as tomography and seismic interferometry. Read
more here. Mesa Scrip Support
The EX-6 now supports the use of Mesa script files for controlling the
operation of the EX-6 in 3D surveys. Read more here.
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