GSP-1 Geochain System Panel
The Geochain System Panel, GSP, has been designed as both the surface recording panel for the new digital GeochainTM system and as a replacement for our highly successful PDAQ analogue recorder.
Over 300 GSP systems are in use today. The panel can have a maximum of sixteen analogue seismic channels along with the standard digital input section. The panel can therefore be used with any analogue borehole seismic tools or with our latest GeochainTM digital string.
Main Features
- Up to 16 analogue channels
- 1.536Mb digital interface
- 24 bit delta sigma convertors
- Built in firing circuit
- Optional GPS time stamp
- Full instrument tests function
- USB interface
- Use standard PC running ACQ software
| GSP-1 General | |
| Airgun firing pulse: | Isolated 60V, 30ms pulse |
| Source control outputs: | 4, opto-isolated |
| Timebreak inputs: | 3, opto-isolated |
| Remote start inputs: | 1, opto-isolated |
| Test system: | Fully automatic with comprehensive report generation |
| PC Interface: | USB |
| Power requirements: | 95-260V ac. 50/60 Hz universal input, 50 watts |
| Enclosure: | Standard 19” rack mounting |
| GSP-1 Digital section | |
| Capacity: | 1.536Mbps data stream |
| Interface: | RS422 (As 2065 DIF module option) |
| Cable equalisation: | Fully automatic using internal DSP chip |
| Format: | Software configured to match system |
| GSP-1 Analogue section | |
| No. of channels: | 2-16 |
| Sample intervals: | 0.25, 0.5, 1.0, 1.25, 2.0, 2.5, 4.0ms |
| A/D convertor: | 24 bit Delta-Sigma |
| Dynamic Range: | <112dB @ 0dB pre-gain (minimum) |
| Distortion: | <0.01% (0.003% typical) @31.25 Hz, 15V pp signal |
| Noise: | <10uV rms @ 1ms, 0dB pre-gain |
| Input: | Differential, 20V pp max |
| Inter-channel skew: | Zero |
| Timing Accuracy: | 10ppm |
Functionality
The analogue channels use 24 bit delta-sigma converters for improved dynamic range and to remove the need for complex IFP gain stages. The maximum sample rate is 0.25 ms, which allows very high frequency seismic data to be recorded.
The digital section automatically selects the highest data rate that the cable will support. The maximum dual rate is 1.536 Mb s-1 with a fall back rate of 256 kb s-1 for use on poor quality cables. An on-board DSP chip provides automatic and adaptive equalisation of the wireline characteristics. There are therefore no manual filter settings.
Communication with the PC recording system is by USB serial interface. The USB interface will allow the panel to be used with all modern PC’s.
The GSP incorporates a single airgun firing circuit for use on simple checkshot surveys. Four independent external control circuits give control over external source controllers such as our own RSS four gun remote gun firing system.
The panel provides fully automatic DC offset and gain calibration along with full instrument tests. The i-test reports are generated on the PC for archiving or for passing onto the client.
Full support for the panel is provided under our ACQ acquisition software. Please see our separate brochure to see the depth and flexibility of this highly acclaimed package.
- Firing Circuit (FC) allows GSP to trigger a single air gun without any additional equipment.
- GSPIO module includes: external source control interface, power control circuitry and controls the FC.
- Dual seismic interface (DSI) allows between 2-16 Analogue channels.
- CPU2 offers both a GPS time stamp and depth encoded interface.
- Test signal generator (TSG) able to generate either precision sine wave signals or single sample impulses.
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