RAS-24 Engineering Seismograph Specifications
| GENERAL | |
| Number of Channels: | 12 or 24 per RAS module, up to 240 channels per system (10 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 |
| RAS-24 MODULE | |
| 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 |
Seistronix reserves the right to change specifications
| Phone: 916-851-1890 | Fax: 916-851-1852 | Email: sales@seistronix.com |