Geospace Technologies GSR Geospace Seismic Recorder (GSR) User Manual Geospace Seismic Recorder GSR

Geospace Technologies Corporation Geospace Seismic Recorder (GSR) Geospace Seismic Recorder GSR

Users Manual Revised

Geospace Seismic Recorder (GSR) USER MANUAL OYO GEOSPACE 7007 Pinemont Houston, TX 77040 USA This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by Oyo Geospace could void the user’s authority to operate this equipment. Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense. GSR User Manual 1of 7 16 June 2008
GSR MODULE Deployment The GSR should be deployed with the metal plate down. This provides sufficient earth grounding and maximum cooling of the unit as well as providing the GPS receiver in the top to the unit with an ideal “view” of the satalite constellation. The seismic sensors should be deployed and plugged into the seismic input connector prior to connection of the battery. The seismic input connector is black on the single channel unit and blue on the multiple channel units. Once the sensors are deployed and attached, connect the battery cable to the red connector. The GSR will immediately begin a power on self test. The GSR will test all of its internal circuits followed immediately by an impedance test of the seismic sensors. The LED that can be seen from the top of the GSR will flash codes to indicate the GSRs condition. The GSR will then enable the Global Positioning System (GPS) receiver and begin to flash the code that indicates that it is searching for satalites. Within a few seconds the GPS receiver will have sufficient satalite information to obtain a 3 dimensional fix. The flash code will change to indicate this condition and the GSR will now begin to acquire seismic data if it has been programmed to begin recording immediately. See Programming below. After several minutes the internal GSR clock will be sufficiently disciplined and the GPS receiver will be turned off. The flash code will again change to indicate this state. See the flash codes below. Radio Status Monitoring A GSR may be connected to a laptop computer and used as a hub to monitor the status of any GSRs within a 50m to 100m radius via a high frequency radio link. In this mode the loptop/hub GSR User Manual 2of 7 16 June 2008
GSR User Manual 3of 7 16 June 2008 monitors and logs status information from all of the GSRs that it communicates with. The laptop stores the GPS location, acquisition status, temperature, battery status and the non-volatile memory status of each GSR. By moving the hub throughout the seismic spread all of the GSRs in the survey may be monitored and logged. This logging may take place during acquisition of seismic data with no adverse effect on the data quality. Flash Codes GSR Start-up Error Codes Critical GSR Error: LED flashes repeatedly on solid for 1 second followed by off for one second. Critical Seis Input 1 Error: LED on solid for 1 second followed by 1 short pulse. Critical Seis Input 2 Error: LED on solid for 1 second followed by 2 short pulses. Critical Seis Input 3 Error: LED on solid for 1 second followed by 3 short pulses. Critical Seis Input 4 Error: LED on solid for 1 second followed by 4 short pulses. Critical Battery Error: LED on solid for 1 second followed by 5 short pulses. Non-Volitile Memory Error: LED on solid for 1 second followed by 6 short pulses. Non-Volitile Memory Full: LED on solid for 1 second followed by 7 short pulses. GSR Run Time Codes GPS on but no GPS fix: One LED flash per second. GPS on with GPS fix: Two quick flashes once per second. Recording with GPS off: One quick flash each 8 seconds. Sleeping: Two quick flashes each 10 seconds. Running geophone tests: LED flashes on for 10 ms 5 times per second. Downloading The GSR non-volatile memory may be read and cleared by removing the battery connection and inserting the unit into one of the outlets in the GeoReaper. See the GeoReaper User Manual for further instruction. Programming The GSR recording parameters such as sample rate, pre-amp gain, record mode, and testing, are programmed and stored in non-volatile memory in the GSR by the GeoReaper. See the GeoReaper User Manual for further instruction.
• Scalability greater than 50,000 channels • Delivers high resolution with a 24-bit delta-sigma ADC • Built-in GPS receiver and disciplined clock • Up to 30 days of continuous recording • Compatible with explosive, vibratory and impulsive energy sources • Accepts standard analog sensor inputs • Has a built-in full resolution test generator • Available as 1, 2, 3 or 4 channel versions • Has an LED Status/Deployment State Indicator • RFID for location/inventory assistance • Wireless short range communication for status verification GSR User Manual 4of 7 16 June 2008
Geospace Seismic Recorder (GSR) GSR System Tests The seismic channel performance and sensor tests can be performed by the GSR System. The user can choose a partial or complete set of tests that can be run in sequence. The user can also choose to display all of the results or only the failures. In the tests described below, the System Software automatically controls the ChanneGSR User Manual 5of 7 16 June 2008 l Input Switch Positions and Test Oscillator Settings during the tests. All tests can be run at all sample intervals and preamp gains of the GSR. - Harmonic Distortion - Gain Accuracy - Impulse Response - Common Mode Rejection - Equivalent Input Noise - Geophone Impedance and THD - Instantaneous System Dynamic Range - Crossf eed (multi-channel) All specifications subject to change without notice Cable-Free Autonomous Data Recording The GSR is designed for cable-free/radio-free seismic data recording. The self-contained unit includes 1 to 4 channels of 24-bit digitization, an integrated/high sensitivity GPS receiver, built-in test signal generator, up to 4 GB per channel of non-volatile solid-state data storage, and a high-speed data port. The unit is housed in a sealed case, with input connector, extended life battery connector/data port connector. Above: GSR Data Recorder.Below: GSR unit connected to geophone string and battery unit. Above: GSR Battery Unit
Geospace Seismic Recorder (GSR) Features and Specifications GSR User Manual 6of 7 16 June 2008 24-bit digital recorder Built-in GPS and disciplined clock Built-in full resolution test signal generator Solid-state flash memory Scalability greater than 50,000 channels Greater than 30 days of continuous recording Compatible with vibratory, explosive and impulsive energy sources. LED Status/Deployment State Indicator RFID for location & inventory assistance Accepts standard analog sensor input IEEE 802.15.4 wireless status retrieval • Available as 1,2,3, or 4 channel versions • 24-bit delta-sigma ADC • 3 Hz to 1600 Hz freq. response • <1 μsec. of UTC (GPS clock) • Up to 4 GBytes per channel flash memory storage • 12 Volt external battery • Operating Temperature: -40° C to +85° C • Humidity: 0 to 100% • Selectable Gains: - X1, X2, X4, X8, X16, X32, X64 0, 6, 12, 18, 24, 30, 36 dB • Sample Intervals: - 4, 2, 1, .5, .25 milliseconds • Max Timing Error: 20 μseconds Max input signal: 1.80 Vrms @ 0 Gain Total Dynamic Range: 140 dB System Dynamic Range @ 0dB Gain: 126 dB @ 4 msec SI 124 dB @ 2 msec SI 120 dB @ 1 msec SI 117 dB @ .5 msec SI 106 dB @ .25 msec SI Equivalent Input Noise @ 2 msec SI: 1.13 μV @ Gain 0 dB .58 μV @ Gain 6 dB .33 μV @ Gain 12 dB .22 μV @ Gain 18 dB .19 μV @ Gain 24 dB .18 μV @ Gain 30 dB .17μV@Gain36dB Input Impedance: 20 kohms/0.06 μf Difference Mode 205 kohms Common Mode System Dynamic Range @ 2 msec SI 124 dB @ Gain 0 dB 123 dB @ Gain 6 dB 122 dB @ Gain 12 dB 120 dB @ Gain 18 dB 115 dB @ Gain 24 dB 110 dB @ Gain 30 dB 105 dB @ Gain 36 dB Total Harmonic Distortion: 0.0005% Common Mode Rejection: 0.001% Gain Accuracy: 1% Anti Alias Filter: Rejection @ Nyquist: 130 dB Frequency @ -3 dB: 0.87 Nyquist Linear or Minimum Phase Time Standard: <1 ppm Weight: 2 pounds Max. Dimension: 3.5"Wx3.0"Hx6.67"L For more information: gshields@oyogeospace.com • Tel: 713.986.4444 • Fax: 713.986.4445 All specifications subject to change without notice
Geospace Seismic Recorder (GSR) GeoRes-XTC GSR Data Management System The GeoRes-XTC consists of two embedded software modules: GeoReaper performs pre-deployment param rete programming, i.e. sample rate, pre-amp gain, record mode, testing, etc. and data c eoll ction via Ethernet connection to the Data Transfer Module (DTM) and a high speed PC. GeoMerge allows the system to read and import all three major components of SPS (R, S and X records). It will merge all GSR data int Eo S G-D or SEG-2 files according to SPS X records (Cross-Reference File, sorted in the same order as the Source 'S' File) and convert all latitude and longitude information in hto t e same coordinates used in the SPS files. These data are then output to the field dat hard media abase (RAID memory) and/or (tape, disk, etc.). The GeoRes-XTC is compatible with third pa tyr generated SPS files. GSR User Manual 7of 7 16 June 2008 GeoRes-XTC High Spee d Computer Data Transfer Module (DTM) 7007 Pinemont • Houston, T xas, U.S.A. • www.oyogeospace.com eTel: 713 986-4444 • Fax: 713 986-4445 Regional Offices OYO Geospace Canada, Inc. 2735-37 Avenue N.E. Calgary, Alberta, Canada T1Y 5R8 403 250-9600 OYO Geo-Impulse International LLC Kirovogradska 36 Ufa, ya,Baskortostan, Russia 450001 011 (7) 3472 25 39 73OYO Geospace China Room 700, 7th Floor, Lido Office Tower, Lido Place Jichang Road, Jiang Tai Road, Beijing, 100004, P.R.China 011 (86) 10 643 78 758 OYO Instruments, Europe Ltd. F3 Bramingham Business Park, Enterprise Way, Luton Bedfordshire LU3 4BU, England 011 44 (0) 1582 573 980

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